名单上的Andr​​oid设备上的所有图片单上、设备、图片、oid

2023-09-04 03:23:37 作者:恰逢于你

我试着列出Android设备的所有图像,自14个小时了他们的道路,但我不能。它不断给我了java.lang.RuntimeException:无法启动活动ComponentInfo。误差

我不明白为什么。

任何帮助?

 包com.example.allpicsexample;

进口android.app.Activity;
进口android.content.Context;
进口android.content.Intent;
进口android.database.Cursor;
进口android.net.Uri;
进口android.os.Bundle;
进口android.provider.MediaStore;
进口android.view.Menu;
进口android.view.MenuInflater;
进口android.view.MenuItem;
进口android.view.View;
进口android.view.ViewGroup;
进口android.widget.AdapterView;
进口android.widget.BaseAdapter;
进口android.widget.GridView;
进口android.widget.ImageView;
进口android.widget.AdapterView.OnItemClickListener;

/ ** *从SD卡显示图像。 * /公共类MainActivity延伸活动{

/ **
 *光标用于从查询的SD卡上的图像访问结果。
 * /
私人光标指针;
/ *
 *为缩略图图像的ID列索引。
 * /
私人诠释参数:columnIndex;

@覆盖
公共无效的onCreate(包savedInstanceState){
    super.onCreate(savedInstanceState);
    的setContentView(R.layout.activity_main);

    串文件路径= cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA));
    的System.out.println(路径是:+文件路径);

}
}
 

和这里的LogCat中的信息:

  

11-14 08:29:01.739:D / AndroidRuntime(16788):关闭VM 11-14   08:29:01.739:W / dalvikvm(16788):主题ID = 1:螺纹退出与   未捕获的异常(组= 0x40018578)8月11号至一十四日:29:01.749:   E / AndroidRuntime(16788):致命异常:主要8月11日至一十四日:29:01.749:   E / AndroidRuntime(16788):java.lang.RuntimeException的:无法启动   活动   ComponentInfo {com.example.allpicsexample / com.example.allpicsexample.MainActivity}:   显示java.lang.NullPointerException 8月11日至一十四日:29:01.749:   E / AndroidRuntime(16788):在   android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)   8月11日至14日:29:01.749:E / AndroidRuntime(16788):在   android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)   8月11日至14日:29:01.749:E / AndroidRuntime(16788):在   android.app.ActivityThread.access $ 1500(ActivityThread.java:117)11-14   08:29:01.749:E / AndroidRuntime(16788):在   android.app.ActivityThread $ H.handleMessage(ActivityThread.java:935)   8月11日至14日:29:01.749:E / AndroidRuntime(16788):在   android.os.Handler.dispatchMessage(Handler.java:99)11-14   08:29:01.749:E / AndroidRuntime(16788):在   android.os.Looper.loop(Looper.java:130)八月11日至十四日:29:01.749:   E / AndroidRuntime(16788):在   android.app.ActivityThread.main(ActivityThread.java:3687)11-14   08:29:01.749:E / AndroidRuntime(16788):在   java.lang.reflect.Method.invokeNative(本机方法)11-14   08:29:01.749:E / AndroidRuntime(16788):在   java.lang.reflect.Method.invoke(Method.java:507)11月14日08:29:01.749:   E / AndroidRuntime(16788):在   com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:867)   8月11日至14日:29:01.749:E / AndroidRuntime(16788):在   com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)11-14   08:29:01.749:E / AndroidRuntime(16788):在   dalvik.system.NativeStart.main(本机方法)8月十一号至14日:29:01.749:   E / AndroidRuntime(16788):由:显示java.lang.NullPointerException   8月11日至14日:29:01.749:E / AndroidRuntime(16788):在   com.example.allpicsexample.MainActivity.onCreate(MainActivity.java:37)   8月11日至14日:29:01.749:E / AndroidRuntime(16788):在   android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)   8月11日至14日:29:01.749:E / AndroidRuntime(16788):在   android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)   8月11日至14日:29:01.749:E / AndroidRuntime(16788):...... 11多个

下面是实施Abhishek的code第二崩溃日志后

  

11-14 10:00:20.159:D / AndroidRuntime(19266):关闭VM 11-14   10:00:20.159:W / dalvikvm(19266):主题ID = 1:螺纹退出与   未捕获的异常(组= 0x40018578)10月11日至十四日:00:20.189:   E / AndroidRuntime(19266):致命异常:主要的10月11日至一十四号:00:20.189:   E / AndroidRuntime(19266):android.app.SuperNotCalledException:活动   {com.example.allpicsexample / com.example.allpicsexample.MainActivity}   没叫过到super.onCreate()10月11日至一十四号:00:20.189:   E / AndroidRuntime(19266):在   android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1617)   10月11号至十四号:00:20.189:E / AndroidRuntime(19266):在   android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)   10月11号至十四号:00:20.189:E / AndroidRuntime(19266):在   android.app.ActivityThread.access $ 1500(ActivityThread.java:117)11-14   10:00:20.189:E / AndroidRuntime(19266):在   android.app.ActivityThread $ H.handleMessage(ActivityThread.java:935)   10月11号至十四号:00:20.189:E / AndroidRuntime(19266):在   android.os.Handler.dispatchMessage(Handler.java:99)11-14   10:00:20.189:E / AndroidRuntime(19266):在   android.os.Looper.loop(Looper.java:130)10月11号至十四日:00:20.189:   E / AndroidRuntime(19266):在   android.app.ActivityThread.main(ActivityThread.java:3687)11-14   10:00:20.189:E / AndroidRuntime(19266):在   java.lang.reflect.Method.invokeNative(本机方法)11-14   10:00:20.189:E / AndroidRuntime(19266):在   java.lang.reflect.Method.invoke(Method.java:507)11月14日10:00:20.189:   E / AndroidRuntime(19266):在   com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:867)   10月11号至十四号:00:20.189:E / AndroidRuntime(19266):在   com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)11-14   10:00:20.189:E / AndroidRuntime(19266):在   dalvik.system.NativeStart.main(本机方法)

解决方案

您所得到的异常,因为你没有初始化光标对象。 您可以使用下面的code让所有图像路径。

 最终的String []列= {MediaStore.Images.Media.DATA,MediaStore.Images.Media._ID};
        最后弦乐排序依据= MediaStore.Images.Media._ID;
        //存储所有从游标图库中的图片
        光标光标= getContentResolver()查询(
                MediaStore.Images.Media.EXTERNAL_CONTENT_URI,列,空,
                空,排序依据);
        //图像总数
        诠释计数= cursor.getCount();

        //创建一个数组来存储路径的所有图片
        的String [] arrPath =新的String [统计]

        的for(int i = 0; I<计数;我++){
            cursor.moveToPosition(ⅰ);
            INT dataColumnIndex = cursor.getColumnIndex(MediaStore.Images.Media.DATA);
            //存储图像的路径
            arrPath [I] = cursor.getString(da​​taColumnIndex);
            Log.i(PATH,arrPath [I]);
        }
 

I was trying to list all the images in android device with their paths since 14 hours straight but I wasn't able to .. It keeps giving me "java.lang.RuntimeException: Unable to start activity ComponentInfo" error.

I don't understand why..

Any help??

package com.example.allpicsexample;

import android.app.Activity; 
import android.content.Context; 
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle; 
import android.provider.MediaStore;
import android.view.Menu; 
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView; 
import android.widget.AdapterView.OnItemClickListener;

/** * Displays images from an SD card. */ public class MainActivity extends Activity {

/**
 * Cursor used to access the results from querying for images on the SD card.
 */
private Cursor cursor;
/*
 * Column index for the Thumbnails Image IDs.
 */
private int columnIndex;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    String filePath = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA));
    System.out.println("the path is : "+filePath);

}
}

and here is the LogCat info:

11-14 08:29:01.739: D/AndroidRuntime(16788): Shutting down VM 11-14 08:29:01.739: W/dalvikvm(16788): threadid=1: thread exiting with uncaught exception (group=0x40018578) 11-14 08:29:01.749: E/AndroidRuntime(16788): FATAL EXCEPTION: main 11-14 08:29:01.749: E/AndroidRuntime(16788): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.allpicsexample/com.example.allpicsexample.MainActivity}: java.lang.NullPointerException 11-14 08:29:01.749: E/AndroidRuntime(16788): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651) 11-14 08:29:01.749: E/AndroidRuntime(16788): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667) 11-14 08:29:01.749: E/AndroidRuntime(16788): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 11-14 08:29:01.749: E/AndroidRuntime(16788): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935) 11-14 08:29:01.749: E/AndroidRuntime(16788): at android.os.Handler.dispatchMessage(Handler.java:99) 11-14 08:29:01.749: E/AndroidRuntime(16788): at android.os.Looper.loop(Looper.java:130) 11-14 08:29:01.749: E/AndroidRuntime(16788): at android.app.ActivityThread.main(ActivityThread.java:3687) 11-14 08:29:01.749: E/AndroidRuntime(16788): at java.lang.reflect.Method.invokeNative(Native Method) 11-14 08:29:01.749: E/AndroidRuntime(16788): at java.lang.reflect.Method.invoke(Method.java:507) 11-14 08:29:01.749: E/AndroidRuntime(16788): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867) 11-14 08:29:01.749: E/AndroidRuntime(16788): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625) 11-14 08:29:01.749: E/AndroidRuntime(16788): at dalvik.system.NativeStart.main(Native Method) 11-14 08:29:01.749: E/AndroidRuntime(16788): Caused by: java.lang.NullPointerException 11-14 08:29:01.749: E/AndroidRuntime(16788): at com.example.allpicsexample.MainActivity.onCreate(MainActivity.java:37) 11-14 08:29:01.749: E/AndroidRuntime(16788): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 11-14 08:29:01.749: E/AndroidRuntime(16788): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615) 11-14 08:29:01.749: E/AndroidRuntime(16788): ... 11 more

Here is the 2nd crash log after implementing Abhishek's code

11-14 10:00:20.159: D/AndroidRuntime(19266): Shutting down VM 11-14 10:00:20.159: W/dalvikvm(19266): threadid=1: thread exiting with uncaught exception (group=0x40018578) 11-14 10:00:20.189: E/AndroidRuntime(19266): FATAL EXCEPTION: main 11-14 10:00:20.189: E/AndroidRuntime(19266): android.app.SuperNotCalledException: Activity {com.example.allpicsexample/com.example.allpicsexample.MainActivity} did not call through to super.onCreate() 11-14 10:00:20.189: E/AndroidRuntime(19266): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1617) 11-14 10:00:20.189: E/AndroidRuntime(19266): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667) 11-14 10:00:20.189: E/AndroidRuntime(19266): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 11-14 10:00:20.189: E/AndroidRuntime(19266): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935) 11-14 10:00:20.189: E/AndroidRuntime(19266): at android.os.Handler.dispatchMessage(Handler.java:99) 11-14 10:00:20.189: E/AndroidRuntime(19266): at android.os.Looper.loop(Looper.java:130) 11-14 10:00:20.189: E/AndroidRuntime(19266): at android.app.ActivityThread.main(ActivityThread.java:3687) 11-14 10:00:20.189: E/AndroidRuntime(19266): at java.lang.reflect.Method.invokeNative(Native Method) 11-14 10:00:20.189: E/AndroidRuntime(19266): at java.lang.reflect.Method.invoke(Method.java:507) 11-14 10:00:20.189: E/AndroidRuntime(19266): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867) 11-14 10:00:20.189: E/AndroidRuntime(19266): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625) 11-14 10:00:20.189: E/AndroidRuntime(19266): at dalvik.system.NativeStart.main(Native Method)

解决方案

You are getting the exception because you have not initialized cursor object. You can use the below code to get path of all the images.

final String[] columns = { MediaStore.Images.Media.DATA, MediaStore.Images.Media._ID };
        final String orderBy = MediaStore.Images.Media._ID;
        //Stores all the images from the gallery in Cursor
        Cursor cursor = getContentResolver().query(
                MediaStore.Images.Media.EXTERNAL_CONTENT_URI, columns, null,
                null, orderBy);
        //Total number of images
        int count = cursor.getCount();

        //Create an array to store path to all the images
        String[] arrPath = new String[count];

        for (int i = 0; i < count; i++) {
            cursor.moveToPosition(i);
            int dataColumnIndex = cursor.getColumnIndex(MediaStore.Images.Media.DATA);
            //Store the path of the image
            arrPath[i]= cursor.getString(dataColumnIndex);
            Log.i("PATH", arrPath[i]);
        }