我处理与地图apiv2。而我收到以下错误而编码对话片段类。
错误:避免非默认的构造函数的片段:使用默认的构造函数加上片段#setArguments(捆绑)代替:
这是在code:
公共PlaceDialogFragment(){
超();
}
公共PlaceDialogFragment(广场的地方,DisplayMetrics DM){
超();
this.mPlace =地方;
this.mMetrics = DM;
}
任何帮助WUD是AP preciated ..
修订:这是整个code ......我米样的新手和从未有过处理fragments..I正在经历一个地图啧啧,发现this..can你现在细说笏ü试图解释..
包com.example.travelplanner;
进口java.io.IOException异常;
进口的java.io.InputStream;
进口java.net.HttpURLConnection中;
进口的java.net.URL;
进口android.graphics.Bitmap;
进口android.graphics.BitmapFactory;
进口android.os.AsyncTask;
进口android.os.Bundle;
进口android.support.v4.app.DialogFragment;
进口android.util.DisplayMetrics;
进口android.util.Log;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.ViewGroup;
进口android.widget.ImageView;
进口android.widget.TextView;
进口android.widget.Toast;
进口android.widget.ViewFlipper;
//定义DialogFragment类来说明这个地方的细节与照片
公共类PlaceDialogFragment扩展DialogFragment {
TextView的mTVPhotosCount = NULL;
TextView的mTVVicinity = NULL;
ViewFlipper mFlipper = NULL;
将mPlace = NULL;
DisplayMetrics mMetrics = NULL;
公共PlaceDialogFragment(){
超();
}
公共PlaceDialogFragment(广场的地方,DisplayMetrics DM){
超();
this.mPlace =地方;
this.mMetrics = DM;
}
@覆盖
公共无效的onCreate(包savedInstanceState){
//对于保留在屏幕上旋转的片段
setRetainInstance(真正的);
super.onCreate(savedInstanceState);
}
@覆盖
公共查看onCreateView(LayoutInflater充气,容器的ViewGroup,
捆绑savedInstanceState){
视图V = inflater.inflate(R.layout.dialog_layout,NULL);
//获取参考ViewFlipper
mFlipper =(ViewFlipper)v.findViewById(R.id.flipper);
//获取参考TextView中显示照片计数
mTVPhotosCount =(TextView中)v.findViewById(R.id.tv_photos_count);
//获取参考TextView的显示位置附近
mTVVicinity =(TextView中)v.findViewById(R.id.tv_vicinity);
如果(mPlace!= NULL){
//设置的对话片段标题
。getDialog()的setTitle(mPlace.mPlaceName);
//照片的引用数组
照片[]照片= mPlace.mPhotos;
//设置照片计数
mTVPhotosCount.setText(可用的照片:+ photos.length);
//设置场所的附近
mTVVicinity.setText(mPlace.mVicinity);
//创建ImageDownloadTask阵列下载照片
ImageDownloadTask [] imageDownloadTask =新ImageDownloadTask [photos.length]
INT宽度=(int)的(mMetrics.widthPixels * 3)/ 4;
INT高度=(int)的(mMetrics.heightPixels * 1)/ 2;
字符串URL =https://maps.googleapis.com/maps/api/place/photo?;
字符串键=键= AIzaSyBSo1xlML-tOFTCdJb6qIbVnF9e7y5nj0o;
弦传感器=传感器=真;
字符串=了maxWidth=了maxWidth+宽;
字符串=了maxHeight=了maxHeight+高度;
URL =网址+&放大器; +按键+&放大器; +传感器+&放大器; + +了maxWidth与& +了maxHeight;
//通过遍历所有的photoreferences
的for(int i = 0; I< photos.length;我++){
//创建任务,下载第i个照片
imageDownloadTask [我] =新ImageDownloadTask();
字符串photoReference =photoreference =+照片[I] .mPhotoReference;
// URL下载从谷歌服务的照片
URL =网址+&放大器; + photoReference;
//下载第i个照片从上面的网址
imageDownloadTask [I] .execute(URL);
}
}
返回伏;
}
@覆盖
公共无效onDestroyView(){
如果(getDialog()= NULL和放大器;!&安培; getRetainInstance())
getDialog()setDismissMessage(空)。
super.onDestroyView();
}
私人位图downloadImage(字符串strUrl)抛出IOException异常{
点阵位图= NULL;
的InputStream的IStream = NULL;
尝试{
网址URL =新的URL(strUrl);
/ **创建HTTP连接communcate与URL * /
HttpURLConnection的的URLConnection =(HttpURLConnection类)url.openConnection();
/ **连接到URL * /
urlConnection.connect();
从URL / **读取数据* /
的IStream = urlConnection.getInputStream();
/ **创建位图从流从URL *返回/
位= BitmapFactory.de codeStream(istream的);
}赶上(例外五){
Log.d(异常边下载网址,e.toString());
}最后{
iStream.close();
}
返回的位图;
}
私有类ImageDownloadTask扩展的AsyncTask<字符串,整数,位图> {
点阵位图= NULL;
@覆盖
受保护的位图doInBackground(字符串... URL){
尝试{
//启动映像下载
位图= downloadImage(网址[0]);
}赶上(例外五){
Log.d(后台任务,e.toString());
}
返回的位图;
}
@覆盖
保护无效onPostExecute(位图的结果){
//创建ImageView的实例显示下载的图像
ImageView的iView中=新ImageView的(getActivity()getBaseContext());
//设置在ImageView的下载图像
iView.setImageBitmap(结果);
//添加ImageView的到ViewFlipper
mFlipper.addView(iView中);
//显示下载完成消息
Toast.makeText(getActivity()getBaseContext(),图像成功下载,Toast.LENGTH_SHORT).show();
}
}
}
解决方案
如果你想出来的规则,只是做下一个
@燮pressLint(ValidFragment)
公共PlaceDialogFragment(广场的地方,DisplayMetrics DM){
超();
this.mPlace =地方;
this.mMetrics = DM;
}
I am dealing with maps apiv2. And I am getting the following error while coding for Dialog Fragment class.
Error : Avoid non-default constructors in fragments: use a default constructor plus Fragment#setArguments(Bundle) instead:
This is the code :
public PlaceDialogFragment(){
super();
}
public PlaceDialogFragment(Place place, DisplayMetrics dm){
super();
this.mPlace = place;
this.mMetrics = dm;
}
Any help wud be appreciated..
Revised: This is the whole code...I m kind of a newbie and never before dealt with fragments..I was going through a maps tut and found this..can you elaborate now wat u were trying to explain..
package com.example.travelplanner;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ViewFlipper;
// Defining DialogFragment class to show the place details with photo
public class PlaceDialogFragment extends DialogFragment{
TextView mTVPhotosCount = null;
TextView mTVVicinity = null;
ViewFlipper mFlipper = null;
Place mPlace = null;
DisplayMetrics mMetrics = null;
public PlaceDialogFragment(){
super();
}
public PlaceDialogFragment(Place place, DisplayMetrics dm){
super();
this.mPlace = place;
this.mMetrics = dm;
}
@Override
public void onCreate(Bundle savedInstanceState) {
// For retaining the fragment on screen rotation
setRetainInstance(true);
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.dialog_layout, null);
// Getting reference to ViewFlipper
mFlipper = (ViewFlipper) v.findViewById(R.id.flipper);
// Getting reference to TextView to display photo count
mTVPhotosCount = (TextView) v.findViewById(R.id.tv_photos_count);
// Getting reference to TextView to display place vicinity
mTVVicinity = (TextView) v.findViewById(R.id.tv_vicinity);
if(mPlace!=null){
// Setting the title for the Dialog Fragment
getDialog().setTitle(mPlace.mPlaceName);
// Array of references of the photos
Photo[] photos = mPlace.mPhotos;
// Setting Photos count
mTVPhotosCount.setText("Photos available : " + photos.length);
// Setting the vicinity of the place
mTVVicinity.setText(mPlace.mVicinity);
// Creating an array of ImageDownloadTask to download photos
ImageDownloadTask[] imageDownloadTask = new ImageDownloadTask[photos.length];
int width = (int)(mMetrics.widthPixels*3)/4;
int height = (int)(mMetrics.heightPixels*1)/2;
String url = "https://maps.googleapis.com/maps/api/place/photo?";
String key = "key=AIzaSyBSo1xlML-tOFTCdJb6qIbVnF9e7y5nj0o";
String sensor = "sensor=true";
String maxWidth="maxwidth=" + width;
String maxHeight = "maxheight=" + height;
url = url + "&" + key + "&" + sensor + "&" + maxWidth + "&" + maxHeight;
// Traversing through all the photoreferences
for(int i=0;i<photos.length;i++){
// Creating a task to download i-th photo
imageDownloadTask[i] = new ImageDownloadTask();
String photoReference = "photoreference="+photos[i].mPhotoReference;
// URL for downloading the photo from Google Services
url = url + "&" + photoReference;
// Downloading i-th photo from the above url
imageDownloadTask[i].execute(url);
}
}
return v;
}
@Override
public void onDestroyView() {
if (getDialog() != null && getRetainInstance())
getDialog().setDismissMessage(null);
super.onDestroyView();
}
private Bitmap downloadImage(String strUrl) throws IOException{
Bitmap bitmap=null;
InputStream iStream = null;
try{
URL url = new URL(strUrl);
/** Creating an http connection to communcate with url */
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
/** Connecting to url */
urlConnection.connect();
/** Reading data from url */
iStream = urlConnection.getInputStream();
/** Creating a bitmap from the stream returned from the url */
bitmap = BitmapFactory.decodeStream(iStream);
}catch(Exception e){
Log.d("Exception while downloading url", e.toString());
}finally{
iStream.close();
}
return bitmap;
}
private class ImageDownloadTask extends AsyncTask<String, Integer, Bitmap>{
Bitmap bitmap = null;
@Override
protected Bitmap doInBackground(String... url) {
try{
// Starting image download
bitmap = downloadImage(url[0]);
}catch(Exception e){
Log.d("Background Task",e.toString());
}
return bitmap;
}
@Override
protected void onPostExecute(Bitmap result) {
// Creating an instance of ImageView to display the downloaded image
ImageView iView = new ImageView(getActivity().getBaseContext());
// Setting the downloaded image in ImageView
iView.setImageBitmap(result);
// Adding the ImageView to ViewFlipper
mFlipper.addView(iView);
// Showing download completion message
Toast.makeText(getActivity().getBaseContext(), "Image downloaded successfully", Toast.LENGTH_SHORT).show();
}
}
}
解决方案
if you like to be out of rules just do next
@SuppressLint("ValidFragment")
public PlaceDialogFragment(Place place, DisplayMetrics dm){
super();
this.mPlace = place;
this.mMetrics = dm;
}