＆QUOT;不幸的是，应用程序的名称已经停止＆QUOT。 Android设备或模拟器的是、模拟器、应用程序、不幸
2023-09-07 09:19:20
作者：特别漫长
我是新的android开发，我下面的一些教程创建第一个应用程序。 当我想要运行的应用程序，编译器显示没有错误，但在仿真器显示不幸的是，取景器布拉布拉已经停止。
在code：
AndroidManifest.xml文件
＆LT;舱单的xmlns：机器人=http://schemas.android.com/apk/res/android
包=com.example.viewfinderee368
安卓版code =1
机器人：VERSIONNAME =1.0＆GT;
＆lt;应用机器人：图标=@可绘制/图标
机器人：标签=@字符串/ APP_NAME＆GT;
＆LT;活动机器人：名称=。ViewfinderEE368
机器人：标签=@字符串/ APP_NAME
机器人：screenOrientation =景观与GT;
＆LT;意向滤光器＆gt;
＆lt;作用机器人：名称=android.intent.action.MAIN/＆GT;
＆LT;类机器人：名称=android.intent.category.LAUNCHER/＆GT;
＆所述; /意图滤光器＆gt;
＆LT; /活性GT;
＆LT; /用途＆gt;
＆LT;使用-SDK安卓的minSdkVersion =6/＆GT;
＆LT;使用-权限的Android：名称=android.permission.CAMERA/＆GT;
＆LT;使用特征的android：NAME =android.hardware.camera/＆GT;
＆LT;使用特征的android：NAME =android.hardware.camera.autofocus/＆GT;
＆LT; /舱单＆GT;
的src / java文件
包com.example.viewfinderee368;
进口java.io.IOException异常;
进口android.app.Activity;
进口android.content.Context;
进口android.graphics.Bitmap;
进口android.graphics.Canvas;
进口android.graphics.Color;
进口android.graphics.Paint;
进口android.graphics.Rect;
进口android.graphics.RectF;
进口android.hardware.Camera;
进口android.hardware.Camera previewCallback。
进口android.os.Bundle;
进口android.view.SurfaceHolder;
进口android.view.SurfaceView;
进口android.view.View;
进口android.view.Window;
进口android.view.WindowManager;
进口android.view.ViewGroup.LayoutParams;
// ------------------------------------------------ ----------------------
公共类ViewfinderEE368延伸活动{
私人preVIEW米preVIEW;
私人DrawOnTop mDrawOnTop;
@覆盖
保护无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）;
//隐藏窗口标题。
getWindow（）setFlags（WindowManager.LayoutParams.FLAG_FULLSCREEN，WindowManager.LayoutParams.FLAG_FULLSCREEN）。
requestWindowFeature（Window.FEATURE_NO_TITLE）;
//创建我们的preVIEW观点，并将其作为我们活动的内容。
//创建我们DrawOnTop视图。
mDrawOnTop =新DrawOnTop（本）;
米preVIEW =新的preVIEW（这一点，mDrawOnTop）;
的setContentView（M preVIEW）;
addContentView（mDrawOnTop，新的LayoutParams（LayoutParams.WRAP_CONTENT，LayoutParams.WRAP_CONTENT））;
}
}
// ------------------------------------------------ ----------------------
类DrawOnTop扩展视图{
位图mBitmap;
涂料mPaintBlack;
涂料mPaintYellow;
涂料mPaintRed;
涂料mPaintGreen;
涂料mPaintBlue;
byte []的mYUVData;
INT [] mRGBData;
INT mImageWidth，mImageHeight;
INT [] mRedHistogram;
INT [] mGreenHistogram;
INT [] mBlueHistogram;
双[] mBinSquared;
公共DrawOnTop（上下文的背景下）{
超（上下文）;
mPaintBlack =新的油漆（）;
mPaintBlack.setStyle（Paint.Style.FILL）;
mPaintBlack.setColor（Color.BLACK）;
mPaintBlack.setTextSize（25）;
mPaintYellow =新的油漆（）;
mPaintYellow.setStyle（Paint.Style.FILL）;
mPaintYellow.setColor（Color.YELLOW）;
mPaintYellow.setTextSize（25）;
mPaintRed =新的油漆（）;
mPaintRed.setStyle（Paint.Style.FILL）;
mPaintRed.setColor（Color.RED）;
mPaintRed.setTextSize（25）;
mPaintGreen =新的油漆（）;
mPaintGreen.setStyle（Paint.Style.FILL）;
mPaintGreen.setColor（Color.GREEN）;
mPaintGreen.setTextSize（25）;
mPaintBlue =新的油漆（）;
mPaintBlue.setStyle（Paint.Style.FILL）;
mPaintBlue.setColor（Color.BLUE）;
mPaintBlue.setTextSize（25）;
mBitmap = NULL;
mYUVData = NULL;
mRGBData = NULL;
mRedHistogram =新INT [256];
mGreenHistogram =新INT [256];
mBlueHistogram =新INT [256];
mBinSquared =新的双[256];
对于（INT斌= 0;仓＆LT; 256;仓++）
{
mBinSquared [二进制] =（（双）斌）*斌;
} //斌
}
@覆盖
保护无效的OnDraw（帆布油画）{
如果（mBitmap！= NULL）
{
INT canvasWidth = canvas.getWidth（）;
INT canvasHeight = canvas.getHeight（）;
INT newImageWidth = canvasWidth;
INT newImageHeight = canvasHeight;
INT MARGINWIDTH =（canvasWidth - newImageWidth）/ 2;
//转换YUV到RGB
德codeYUV420SP（mRGBData，mYUVData，mImageWidth，mImageHeight）;
//绘制位图
// mBitmap.setPixels（mRGBData，0，mImageWidth，0，0，
// mImageWidth，mImageHeight）;
//矩形的src =新的Rect（0，0，mImageWidth，mImageHeight）;
//矩形DST =新的矩形（MARGINWIDTH，0，
// canvasWidth-MARGINWIDTH，canvasHeight）;
// canvas.drawBitmap（mBitmap，SRC，DST，mPaintBlack）;
//绘制黑色边框
// canvas.drawRect（0，0，MARGINWIDTH，canvasHeight，mPaintBlack）;
// canvas.drawRect（canvasWidth - MARGINWIDTH，0，
// canvasWidth，canvasHeight，mPaintBlack）;
//计算直方图
calculateIntensityHistogram（mRGBData，mRedHistogram，
mImageWidth，mImageHeight，0）;
calculateIntensityHistogram（mRGBData，mGreenHistogram，
mImageWidth，mImageHeight，1）;
calculateIntensityHistogram（mRGBData，mBlueHistogram，
mImageWidth，mImageHeight，2）;
//计算平均
双imageRedMean = 0，imageGreenMean = 0，imageBlueMean = 0;
双redHistogramSum = 0，greenHistogramSum = 0，blueHistogramSum = 0;
对于（INT斌= 0;仓＆LT; 256;仓++）
{
imageRedMean + = mRedHistogram [二进制] *斌;
redHistogramSum + = mRedHistogram [二进制];
imageGreenMean + = mGreenHistogram [二进制] *斌;
greenHistogramSum + = mGreenHistogram [二进制];
imageBlueMean + = mBlueHistogram [二进制] *斌;
blueHistogramSum + = mBlueHistogram [二进制];
} //斌
imageRedMean / = redHistogramSum;
imageGreenMean / = greenHistogramSum;
imageBlueMean / = blueHistogramSum;
//计算二阶矩
双imageRed2ndMoment = 0，imageGreen2ndMoment = 0，imageBlue2ndMoment = 0;
对于（INT斌= 0;仓＆LT; 256;仓++）
{
imageRed2ndMoment + = mRedHistogram [二进制] * mBinSquared [二进制];
imageGreen2ndMoment + = mGreenHistogram [二进制] * mBinSquared [二进制];
imageBlue2ndMoment + = mBlueHistogram [二进制] * mBinSquared [二进制];
} //斌
imageRed2ndMoment / = redHistogramSum;
imageGreen2ndMoment / = greenHistogramSum;
imageBlue2ndMoment / = blueHistogramSum;
双imageRedStdDev =的Math.sqrt（imageRed2ndMoment - imageRedMean * imageRedMean）;
双imageGreenStdDev =的Math.sqrt（imageGreen2ndMoment - imageGreenMean * imageGreenMean）;
双imageBlueStdDev =的Math.sqrt（imageBlue2ndMoment - imageBlueMean * imageBlueMean）;
//绘制平均
串imageMeanStr =平均数（R，G，B）：+的String.Format（。％4克，imageRedMean）+，+的String.Format（％4克。，imageGreenMean）+，+串.format（。％4克，imageBlueMean）;
canvas.drawText（imageMeanStr，MARGINWIDTH + 10-1，30-1，mPaintBlack）;
canvas.drawText（imageMeanStr，MARGINWIDTH + 10 + 1，30-1，mPaintBlack）;
canvas.drawText（imageMeanStr，MARGINWIDTH + 10 + 1，30 + 1，mPaintBlack）;
canvas.drawText（imageMeanStr，MARGINWIDTH + 10-1，30 + 1，mPaintBlack）;
canvas.drawText（imageMeanStr，MARGINWIDTH + 10，30，mPaintYellow）;
//绘制标准偏差
串imageStdDevStr =标准偏差（R，G，B）：+的String.Format（。％4克，imageRedStdDev）+，+的String.Format（。％4克，imageGreenStdDev）+，+的String.Format（。％4克，imageBlueStdDev）;
canvas.drawText（imageStdDevStr，MARGINWIDTH + 10-1，60-1，mPaintBlack）;
canvas.drawText（imageStdDevStr，MARGINWIDTH + 10 + 1，60-1，mPaintBlack）;
canvas.drawText（imageStdDevStr，MARGINWIDTH + 10 + 1，60 + 1，mPaintBlack）;
canvas.drawText（imageStdDevStr，MARGINWIDTH + 10-1，60 + 1，mPaintBlack）;
canvas.drawText（imageStdDevStr，MARGINWIDTH + 10，60，mPaintYellow）;
//绘制红色强度直方图
浮barMaxHeight = 3000;
浮动barWidth =（（浮点）newImageWidth）/ 256;
浮barMarginHeight = 2;
RectF barRect =新RectF（）;
barRect.bottom = canvasHeight - 200;
barRect.left = MARGINWIDTH;
barRect.right = barRect.left + barWidth;
对于（INT斌= 0;仓＆LT; 256;仓++）
{
浮概率=（浮点）mRedHistogram [二进制] /（浮点）redHistogramSum;
barRect.top = barRect.bottom -
Math.min（80，概率* barMaxHeight） - barMarginHeight;
canvas.drawRect（barRect，mPaintBlack）;
barRect.top + = barMarginHeight;
canvas.drawRect（barRect，mPaintRed）;
barRect.left + = barWidth;
barRect.right + = barWidth;
} //斌
//绘制绿色强度直方图
barRect.bottom = canvasHeight - 100;
barRect.left = MARGINWIDTH;
barRect.right = barRect.left + barWidth;
对于（INT斌= 0;仓＆LT; 256;仓++）
{
barRect.top = barRect.bottom - Math.min（80，（（浮点）mGreenHistogram [二进制]）/（（浮点）greenHistogramSum）* barMaxHeight） - barMarginHeight;
canvas.drawRect（barRect，mPaintBlack）;
barRect.top + = barMarginHeight;
canvas.drawRect（barRect，mPaintGreen）;
barRect.left + = barWidth;
barRect.right + = barWidth;
} //斌
//绘制蓝色强度直方图
barRect.bottom = canvasHeight;
barRect.left = MARGINWIDTH;
barRect.right = barRect.left + barWidth;
对于（INT斌= 0;仓＆LT; 256;仓++）
{
barRect.top = barRect.bottom - Math.min（80，（（浮点）mBlueHistogram [二进制]）/（（浮点）blueHistogramSum）* barMaxHeight） - barMarginHeight;
canvas.drawRect（barRect，mPaintBlack）;
barRect.top + = barMarginHeight;
canvas.drawRect（barRect，mPaintBlue）;
barRect.left + = barWidth;
barRect.right + = barWidth;
} //斌
if语句} //结束
super.onDraw（画布）;
} //结束的OnDraw方法
静态公共无效去codeYUV420SP（INT [] RGB，byte []的yuv420sp，诠释的宽度，高度INT）{
最终诠释框架尺寸=宽*高;
对于（INT J = 0，YP = 0; J＆LT;高度; J ++）{
INT UVP =框架尺寸+（J＆GT;→1）*宽度，U = 0，V = 0;
的for（int i = 0; I＆LT;宽度;我++，YP ++）{
INT Y =（0xFF的及（（int）的yuv420sp [YP]）） - 16;
如果（γ℃的）Y = 0;
如果（（ⅰ＆安培; 1）== 0）{
V =（0xFF的＆放大器; yuv420sp [UVP ++]） - 128;
U =（0xFF的＆放大器; yuv420sp [UVP ++]） - 128;
}
INT y1192 = 1192 * Y;
INT R =（y1192 + 1634 * V）;
INT G =（y1192 - 833 * V - 400 * U）;
INT B =（y1192 + 2066 * U）;
如果（为r 0）R = 0;否则，如果（R＆GT; 262143）R = 262143;
如果（克℃，）克= 0;否则，如果（G＆GT; 262143）G = 262143;
如果（b将0）B = 0;否则，如果（B＆GT; 262143）B = 262143;
RGB [YP] = 0xff000000 | （（为r＆10 6）及为0xFF0000）| （（g取代;→2）及为0xFF00）| （（B个大于10）及0xff的）;
}
}
}
静态公共无效去codeYUV420SPGrayscale（INT [] RGB，byte []的yuv420sp，诠释的宽度，高度INT）
{
最终诠释框架尺寸=宽*高;
对于（INT PIX = 0; PIX＆LT;框架尺寸; PIX ++）
{
INT pixVal =（0xFF的及（（int）的yuv420sp [像素]）） - 16;
如果（pixVal℃，）pixVal = 0;
如果（pixVal＆GT; 255）pixVal = 255;
RGB [像素] = 0xff000000 | （pixVal＆LT;＆LT; 16）| （pixVal＆其中;＆所述; 8）| pixVal;
} // PIX
}
静态公共无效calculateIntensityHistogram（INT [] RGB，INT []直方图，诠释的宽度，高度INT，INT组件）
{
对于（INT斌= 0;仓＆LT; 256;仓++）
{
直方图[二进制] = 0;
} //斌
如果（部分== 0）//红色
{
对于（INT PIX = 0; PIX＆LT;宽*高; PIX + = 3）
{
INT pixVal =（RGB [像素]≥＆GT; 16）及0xFF的;
直方图[pixVal] ++;
} // PIX
}
否则，如果（组件== 1）//绿
{
对于（INT PIX = 0; PIX＆LT;宽*高; PIX + = 3）
{
INT pixVal =（RGB [像素]≥→8）及0xFF的;
直方图[pixVal] ++;
} // PIX
}
否则//蓝
{
对于（INT PIX = 0; PIX＆LT;宽*高; PIX + = 3）
{
INT pixVal = RGB [像素]放大器; 0xFF的;
直方图[pixVal] ++;
} // PIX
}
}
}
// ------------------------------------------------ ----------------------
类preVIEW延伸SurfaceView实现SurfaceHolder.Callback {
SurfaceHolder mHolder;
相机mCamera;
DrawOnTop mDrawOnTop;
布尔mFinished;
preVIEW（上下文的背景下，DrawOnTop drawOnTop）{
超（上下文）;
mDrawOnTop = drawOnTop;
mFinished = FALSE;
//安装SurfaceHolder.Callback所以我们得到通知时，该
//下垫面创建和销毁。
mHolder = getHolder（）;
mHolder.addCallback（本）;
mHolder.setType（SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS）;
}
公共无效surfaceCreated（SurfaceHolder持有者）{
mCamera = Camera.open（）;
尝试 {
mCamera.set previewDisplay（保持器）;
// preVIEW回调时使用新的取景框可用
mCamera.set previewCallback（新previewCallback（）{
在previewFrame公共无效（byte []的数据，摄像头摄像头）
{
如果（（mDrawOnTop == NULL）|| mFinished）
返回;
如果（mDrawOnTop.mBitmap == NULL）
{
//初始化平局在最上层的同伴
Camera.Parameters PARAMS = camera.getParameters（）;
mDrawOnTop.mImageWidth = params.get previewSize（）宽。
mDrawOnTop.mImageHeight = params.get previewSize（）的高度。
mDrawOnTop.mBitmap = Bitmap.createBitmap（mDrawOnTop.mImageWidth，
mDrawOnTop.mImageHeight，Bitmap.Config.RGB_565）;
mDrawOnTop.mRGBData =新INT [mDrawOnTop.mImageWidth * mDrawOnTop.mImageHeight]。
mDrawOnTop.mYUVData =新的字节[data.length]
}
//传递YUV数据绘制在最上层的同伴
System.arraycopy（数据，0，mDrawOnTop.mYUVData，0，data.length）;
mDrawOnTop.invalidate（）;
}
}）;
}
赶上（IOException异常除外）{
mCamera.release（）;
mCamera = NULL;
}
}
公共无效surfaceDestroyed（SurfaceHolder持有者）{
//面，当我们返回将被销毁，所以停止了preVIEW。
//因为CameraDevice对象不是共享资源，这是非常
//重要的是要释放它当活动被暂停。
mFinished = TRUE;
mCamera.set previewCallback（空）;
mCamera.stop preVIEW（）;
mCamera.release（）;
mCamera = NULL;
}
公共无效surfaceChanged（SurfaceHolder持有人，INT格式，INT W，INT高）{
//现在的尺寸是已知的，设置相机参数，并开始
//在preVIEW。
Camera.Parameters参数= mCamera.getParameters（）;
parameters.set previewSize（320，240）;
parameters.set previewFrameRate（15）;
parameters.setSceneMode（Camera.Parameters.SCENE_MODE_NIGHT）;
parameters.setFocusMode（Camera.Parameters.FOCUS_MODE_AUTO）;
mCamera.setParameters（参数）;
mCamera.start preVIEW（）;
}
}
我试图运行在模拟器的应用程序，既与实际设备和错误是一样的。
谢谢！
编辑： LogCat中
2月11日至二十号：50：38.943：E / AndroidRuntime（614）：致命异常：主要
2月十一号日至20日：50：38.943：E / AndroidRuntime（614）：java.lang.RuntimeException的：无法启动的活动ComponentInfo {com.example.viewfinderee368 / com.example.viewfinderee368.ViewfinderEE368}：android.util.AndroidRuntimeException：requestFeature （）添加内容之前，必须先调用
2月十一号日至20日：50：38.943：E / AndroidRuntime（614）：在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2059）
2月十一号日至20日：50：38.943：E / AndroidRuntime（614）：在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2084）
2月十一号日至20日：50：38.943：E / AndroidRuntime（614）：在android.app.ActivityThread.access $ 600（ActivityThread.java:130）
2月十一号日至20日：50：38.943：E / AndroidRuntime（614）：在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1195）
2月十一号日至20日：50：38.943：E / AndroidRuntime（614）：在android.os.Handler.dispatchMessage（Handler.java:99）
2月十一号日至20日：50：38.943：E / AndroidRuntime（614）：在android.os.Looper.loop（Looper.java:137）
2月十一号日至20日：50：38.943：E / AndroidRuntime（614）：在android.app.ActivityThread.main（ActivityThread.java:4745）
2月十一号日至20日：50：38.943：E / AndroidRuntime（614）：在java.lang.reflect.Method.invokeNative（本机方法）
2月十一号日至20日：50：38.943：E / AndroidRuntime（614）：在java.lang.reflect.Method.invoke（Method.java:511）
2月十一号日至20日：50：38.943：E / AndroidRuntime（614）：在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:786）
2月十一号日至20日：50：38.943：E / AndroidRuntime（614）：在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:553）
2月十一号日至20日：50：38.943：E / AndroidRuntime（614）：在dalvik.system.NativeStart.main（本机方法）
2月十一号日至20日：50：38.943：E / AndroidRuntime（614）：android.util.AndroidRuntimeException：产生的原因requestFeature（）必须添加内容之前调用
2月十一号日至20日：50：38.943：E / AndroidRuntime（614）：在com.android.internal.policy.impl.PhoneWindow.requestFeature（PhoneWindow.java:215）
2月十一号日至20日：50：38.943：E / AndroidRuntime（614）：在android.app.Activity.requestWindowFeature（Activity.java:3225）
2月十一号日至20日：50：38.943：E / AndroidRuntime（614）：在com.example.viewfinderee368.ViewfinderEE368.onCreate（ViewfinderEE368.java:52）
2月十一号日至20日：50：38.943：E / AndroidRuntime（614）：在android.app.Activity.performCreate（Activity.java:5008）
2月十一号日至20日：50：38.943：E / AndroidRuntime（614）：在android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1079）
2月十一号日至20日：50：38.943：E / AndroidRuntime（614）：在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2023）
2月十一号日至20日：50：38.943：E / AndroidRuntime（614）：11 ...更多
解决方案
您需要有的setContentView（）线旁 super.onCreate （savedInstance）
的setContentView（R.layout.your_layout_filename）;
总是调用的setContentView（）初始化任何UI组件之前，否则你会得到的问题。
I'm new in android development and I'm following some tutorials to create the first apps. When I want to run the app, compiler shows no error but in Emulator shows "Unfortunately, Viewfinder blabla has stopped."
The code:
AndroidManifest.xml file
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.viewfinderee368"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon"
android:label="@string/app_name">
<activity android:name=".ViewfinderEE368"
android:label="@string/app_name"
android:screenOrientation="landscape">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
</application>
<uses-sdk android:minSdkVersion="6"/>
<uses-permission android:name="android.permission.CAMERA"/>
<uses-feature android:name="android.hardware.camera"/>
<uses-feature android:name="android.hardware.camera.autofocus"/>
</manifest>
src/.java file
package com.example.viewfinderee368;
import java.io.IOException;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.hardware.Camera;
import android.hardware.Camera.PreviewCallback;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.ViewGroup.LayoutParams;
// ----------------------------------------------------------------------
public class ViewfinderEE368 extends Activity {
private Preview mPreview;
private DrawOnTop mDrawOnTop;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Hide the window title.
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
requestWindowFeature(Window.FEATURE_NO_TITLE);
// Create our Preview view and set it as the content of our activity.
// Create our DrawOnTop view.
mDrawOnTop = new DrawOnTop(this);
mPreview = new Preview(this, mDrawOnTop);
setContentView(mPreview);
addContentView(mDrawOnTop, new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
}
}
//----------------------------------------------------------------------
class DrawOnTop extends View {
Bitmap mBitmap;
Paint mPaintBlack;
Paint mPaintYellow;
Paint mPaintRed;
Paint mPaintGreen;
Paint mPaintBlue;
byte[] mYUVData;
int[] mRGBData;
int mImageWidth, mImageHeight;
int[] mRedHistogram;
int[] mGreenHistogram;
int[] mBlueHistogram;
double[] mBinSquared;
public DrawOnTop(Context context) {
super(context);
mPaintBlack = new Paint();
mPaintBlack.setStyle(Paint.Style.FILL);
mPaintBlack.setColor(Color.BLACK);
mPaintBlack.setTextSize(25);
mPaintYellow = new Paint();
mPaintYellow.setStyle(Paint.Style.FILL);
mPaintYellow.setColor(Color.YELLOW);
mPaintYellow.setTextSize(25);
mPaintRed = new Paint();
mPaintRed.setStyle(Paint.Style.FILL);
mPaintRed.setColor(Color.RED);
mPaintRed.setTextSize(25);
mPaintGreen = new Paint();
mPaintGreen.setStyle(Paint.Style.FILL);
mPaintGreen.setColor(Color.GREEN);
mPaintGreen.setTextSize(25);
mPaintBlue = new Paint();
mPaintBlue.setStyle(Paint.Style.FILL);
mPaintBlue.setColor(Color.BLUE);
mPaintBlue.setTextSize(25);
mBitmap = null;
mYUVData = null;
mRGBData = null;
mRedHistogram = new int[256];
mGreenHistogram = new int[256];
mBlueHistogram = new int[256];
mBinSquared = new double[256];
for (int bin = 0; bin < 256; bin++)
{
mBinSquared[bin] = ((double)bin) * bin;
} // bin
}
@Override
protected void onDraw(Canvas canvas) {
if (mBitmap != null)
{
int canvasWidth = canvas.getWidth();
int canvasHeight = canvas.getHeight();
int newImageWidth = canvasWidth;
int newImageHeight = canvasHeight;
int marginWidth = (canvasWidth - newImageWidth)/2;
// Convert from YUV to RGB
decodeYUV420SP(mRGBData, mYUVData, mImageWidth, mImageHeight);
// Draw bitmap
// mBitmap.setPixels(mRGBData, 0, mImageWidth, 0, 0,
// mImageWidth, mImageHeight);
// Rect src = new Rect(0, 0, mImageWidth, mImageHeight);
// Rect dst = new Rect(marginWidth, 0,
// canvasWidth-marginWidth, canvasHeight);
// canvas.drawBitmap(mBitmap, src, dst, mPaintBlack);
// Draw black borders
// canvas.drawRect(0, 0, marginWidth, canvasHeight, mPaintBlack);
// canvas.drawRect(canvasWidth - marginWidth, 0,
// canvasWidth, canvasHeight, mPaintBlack);
// Calculate histogram
calculateIntensityHistogram(mRGBData, mRedHistogram,
mImageWidth, mImageHeight, 0);
calculateIntensityHistogram(mRGBData, mGreenHistogram,
mImageWidth, mImageHeight, 1);
calculateIntensityHistogram(mRGBData, mBlueHistogram,
mImageWidth, mImageHeight, 2);
// Calculate mean
double imageRedMean = 0, imageGreenMean = 0, imageBlueMean = 0;
double redHistogramSum = 0, greenHistogramSum = 0, blueHistogramSum = 0;
for (int bin = 0; bin < 256; bin++)
{
imageRedMean += mRedHistogram[bin] * bin;
redHistogramSum += mRedHistogram[bin];
imageGreenMean += mGreenHistogram[bin] * bin;
greenHistogramSum += mGreenHistogram[bin];
imageBlueMean += mBlueHistogram[bin] * bin;
blueHistogramSum += mBlueHistogram[bin];
} // bin
imageRedMean /= redHistogramSum;
imageGreenMean /= greenHistogramSum;
imageBlueMean /= blueHistogramSum;
// Calculate second moment
double imageRed2ndMoment = 0, imageGreen2ndMoment = 0, imageBlue2ndMoment = 0;
for (int bin = 0; bin < 256; bin++)
{
imageRed2ndMoment += mRedHistogram[bin] * mBinSquared[bin];
imageGreen2ndMoment += mGreenHistogram[bin] * mBinSquared[bin];
imageBlue2ndMoment += mBlueHistogram[bin] * mBinSquared[bin];
} // bin
imageRed2ndMoment /= redHistogramSum;
imageGreen2ndMoment /= greenHistogramSum;
imageBlue2ndMoment /= blueHistogramSum;
double imageRedStdDev = Math.sqrt( imageRed2ndMoment - imageRedMean*imageRedMean );
double imageGreenStdDev = Math.sqrt( imageGreen2ndMoment - imageGreenMean*imageGreenMean );
double imageBlueStdDev = Math.sqrt( imageBlue2ndMoment - imageBlueMean*imageBlueMean );
// Draw mean
String imageMeanStr = "Mean (R,G,B): " + String.format("%.4g", imageRedMean) + ", " + String.format("%.4g", imageGreenMean) + ", " + String.format("%.4g", imageBlueMean);
canvas.drawText(imageMeanStr, marginWidth+10-1, 30-1, mPaintBlack);
canvas.drawText(imageMeanStr, marginWidth+10+1, 30-1, mPaintBlack);
canvas.drawText(imageMeanStr, marginWidth+10+1, 30+1, mPaintBlack);
canvas.drawText(imageMeanStr, marginWidth+10-1, 30+1, mPaintBlack);
canvas.drawText(imageMeanStr, marginWidth+10, 30, mPaintYellow);
// Draw standard deviation
String imageStdDevStr = "Std Dev (R,G,B): " + String.format("%.4g", imageRedStdDev) + ", " + String.format("%.4g", imageGreenStdDev) + ", " + String.format("%.4g", imageBlueStdDev);
canvas.drawText(imageStdDevStr, marginWidth+10-1, 60-1, mPaintBlack);
canvas.drawText(imageStdDevStr, marginWidth+10+1, 60-1, mPaintBlack);
canvas.drawText(imageStdDevStr, marginWidth+10+1, 60+1, mPaintBlack);
canvas.drawText(imageStdDevStr, marginWidth+10-1, 60+1, mPaintBlack);
canvas.drawText(imageStdDevStr, marginWidth+10, 60, mPaintYellow);
// Draw red intensity histogram
float barMaxHeight = 3000;
float barWidth = ((float)newImageWidth) / 256;
float barMarginHeight = 2;
RectF barRect = new RectF();
barRect.bottom = canvasHeight - 200;
barRect.left = marginWidth;
barRect.right = barRect.left + barWidth;
for (int bin = 0; bin < 256; bin++)
{
float prob = (float)mRedHistogram[bin] / (float)redHistogramSum;
barRect.top = barRect.bottom -
Math.min(80,prob*barMaxHeight) - barMarginHeight;
canvas.drawRect(barRect, mPaintBlack);
barRect.top += barMarginHeight;
canvas.drawRect(barRect, mPaintRed);
barRect.left += barWidth;
barRect.right += barWidth;
} // bin
// Draw green intensity histogram
barRect.bottom = canvasHeight - 100;
barRect.left = marginWidth;
barRect.right = barRect.left + barWidth;
for (int bin = 0; bin < 256; bin++)
{
barRect.top = barRect.bottom - Math.min(80, ((float)mGreenHistogram[bin])/((float)greenHistogramSum) * barMaxHeight) - barMarginHeight;
canvas.drawRect(barRect, mPaintBlack);
barRect.top += barMarginHeight;
canvas.drawRect(barRect, mPaintGreen);
barRect.left += barWidth;
barRect.right += barWidth;
} // bin
// Draw blue intensity histogram
barRect.bottom = canvasHeight;
barRect.left = marginWidth;
barRect.right = barRect.left + barWidth;
for (int bin = 0; bin < 256; bin++)
{
barRect.top = barRect.bottom - Math.min(80, ((float)mBlueHistogram[bin])/((float)blueHistogramSum) * barMaxHeight) - barMarginHeight;
canvas.drawRect(barRect, mPaintBlack);
barRect.top += barMarginHeight;
canvas.drawRect(barRect, mPaintBlue);
barRect.left += barWidth;
barRect.right += barWidth;
} // bin
} // end if statement
super.onDraw(canvas);
} // end onDraw method
static public void decodeYUV420SP(int[] rgb, byte[] yuv420sp, int width, int height) {
final int frameSize = width * height;
for (int j = 0, yp = 0; j < height; j++) {
int uvp = frameSize + (j >> 1) * width, u = 0, v = 0;
for (int i = 0; i < width; i++, yp++) {
int y = (0xff & ((int) yuv420sp[yp])) - 16;
if (y < 0) y = 0;
if ((i & 1) == 0) {
v = (0xff & yuv420sp[uvp++]) - 128;
u = (0xff & yuv420sp[uvp++]) - 128;
}
int y1192 = 1192 * y;
int r = (y1192 + 1634 * v);
int g = (y1192 - 833 * v - 400 * u);
int b = (y1192 + 2066 * u);
if (r < 0) r = 0; else if (r > 262143) r = 262143;
if (g < 0) g = 0; else if (g > 262143) g = 262143;
if (b < 0) b = 0; else if (b > 262143) b = 262143;
rgb[yp] = 0xff000000 | ((r << 6) & 0xff0000) | ((g >> 2) & 0xff00) | ((b >> 10) & 0xff);
}
}
}
static public void decodeYUV420SPGrayscale(int[] rgb, byte[] yuv420sp, int width, int height)
{
final int frameSize = width * height;
for (int pix = 0; pix < frameSize; pix++)
{
int pixVal = (0xff & ((int) yuv420sp[pix])) - 16;
if (pixVal < 0) pixVal = 0;
if (pixVal > 255) pixVal = 255;
rgb[pix] = 0xff000000 | (pixVal << 16) | (pixVal << 8) | pixVal;
} // pix
}
static public void calculateIntensityHistogram(int[] rgb, int[] histogram, int width, int height, int component)
{
for (int bin = 0; bin < 256; bin++)
{
histogram[bin] = 0;
} // bin
if (component == 0) // red
{
for (int pix = 0; pix < width*height; pix += 3)
{
int pixVal = (rgb[pix] >> 16) & 0xff;
histogram[ pixVal ]++;
} // pix
}
else if (component == 1) // green
{
for (int pix = 0; pix < width*height; pix += 3)
{
int pixVal = (rgb[pix] >> 8) & 0xff;
histogram[ pixVal ]++;
} // pix
}
else // blue
{
for (int pix = 0; pix < width*height; pix += 3)
{
int pixVal = rgb[pix] & 0xff;
histogram[ pixVal ]++;
} // pix
}
}
}
// ----------------------------------------------------------------------
class Preview extends SurfaceView implements SurfaceHolder.Callback {
SurfaceHolder mHolder;
Camera mCamera;
DrawOnTop mDrawOnTop;
boolean mFinished;
Preview(Context context, DrawOnTop drawOnTop) {
super(context);
mDrawOnTop = drawOnTop;
mFinished = false;
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mHolder = getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceCreated(SurfaceHolder holder) {
mCamera = Camera.open();
try {
mCamera.setPreviewDisplay(holder);
// Preview callback used whenever new viewfinder frame is available
mCamera.setPreviewCallback(new PreviewCallback() {
public void onPreviewFrame(byte[] data, Camera camera)
{
if ( (mDrawOnTop == null) || mFinished )
return;
if (mDrawOnTop.mBitmap == null)
{
// Initialize the draw-on-top companion
Camera.Parameters params = camera.getParameters();
mDrawOnTop.mImageWidth = params.getPreviewSize().width;
mDrawOnTop.mImageHeight = params.getPreviewSize().height;
mDrawOnTop.mBitmap = Bitmap.createBitmap(mDrawOnTop.mImageWidth,
mDrawOnTop.mImageHeight, Bitmap.Config.RGB_565);
mDrawOnTop.mRGBData = new int[mDrawOnTop.mImageWidth * mDrawOnTop.mImageHeight];
mDrawOnTop.mYUVData = new byte[data.length];
}
// Pass YUV data to draw-on-top companion
System.arraycopy(data, 0, mDrawOnTop.mYUVData, 0, data.length);
mDrawOnTop.invalidate();
}
});
}
catch (IOException exception) {
mCamera.release();
mCamera = null;
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// Surface will be destroyed when we return, so stop the preview.
// Because the CameraDevice object is not a shared resource, it's very
// important to release it when the activity is paused.
mFinished = true;
mCamera.setPreviewCallback(null);
mCamera.stopPreview();
mCamera.release();
mCamera = null;
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
// Now that the size is known, set up the camera parameters and begin
// the preview.
Camera.Parameters parameters = mCamera.getParameters();
parameters.setPreviewSize(320, 240);
parameters.setPreviewFrameRate(15);
parameters.setSceneMode(Camera.Parameters.SCENE_MODE_NIGHT);
parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
mCamera.setParameters(parameters);
mCamera.startPreview();
}
}
I tried to run the app both in Emulator and real device and the error was the same.
Thanks!
edit: LogCat
11-20 02:50:38.943: E/AndroidRuntime(614): FATAL EXCEPTION: main
11-20 02:50:38.943: E/AndroidRuntime(614): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.viewfinderee368/com.example.viewfinderee368.ViewfinderEE368}: android.util.AndroidRuntimeException: requestFeature() must be called before adding content
11-20 02:50:38.943: E/AndroidRuntime(614): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
11-20 02:50:38.943: E/AndroidRuntime(614): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
11-20 02:50:38.943: E/AndroidRuntime(614): at android.app.ActivityThread.access$600(ActivityThread.java:130)
11-20 02:50:38.943: E/AndroidRuntime(614): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
11-20 02:50:38.943: E/AndroidRuntime(614): at android.os.Handler.dispatchMessage(Handler.java:99)
11-20 02:50:38.943: E/AndroidRuntime(614): at android.os.Looper.loop(Looper.java:137)
11-20 02:50:38.943: E/AndroidRuntime(614): at android.app.ActivityThread.main(ActivityThread.java:4745)
11-20 02:50:38.943: E/AndroidRuntime(614): at java.lang.reflect.Method.invokeNative(Native Method)
11-20 02:50:38.943: E/AndroidRuntime(614): at java.lang.reflect.Method.invoke(Method.java:511)
11-20 02:50:38.943: E/AndroidRuntime(614): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
11-20 02:50:38.943: E/AndroidRuntime(614): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
11-20 02:50:38.943: E/AndroidRuntime(614): at dalvik.system.NativeStart.main(Native Method)
11-20 02:50:38.943: E/AndroidRuntime(614): Caused by: android.util.AndroidRuntimeException: requestFeature() must be called before adding content
11-20 02:50:38.943: E/AndroidRuntime(614): at com.android.internal.policy.impl.PhoneWindow.requestFeature(PhoneWindow.java:215)
11-20 02:50:38.943: E/AndroidRuntime(614): at android.app.Activity.requestWindowFeature(Activity.java:3225)
11-20 02:50:38.943: E/AndroidRuntime(614): at com.example.viewfinderee368.ViewfinderEE368.onCreate(ViewfinderEE368.java:52)
11-20 02:50:38.943: E/AndroidRuntime(614): at android.app.Activity.performCreate(Activity.java:5008)
11-20 02:50:38.943: E/AndroidRuntime(614): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
11-20 02:50:38.943: E/AndroidRuntime(614): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
11-20 02:50:38.943: E/AndroidRuntime(614): ... 11 more
解决方案
You need to have the setContentView() line next to super.onCreate(savedInstance)
setContentView(R.layout.your_layout_filename);
Always call setContentView() before initializing any UI component, Otherwise you will get Issues.
相关推荐
猜您喜欢
精彩图集
