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我一直在尝试制作壁纸应用程序。当我们单击图库中的特定图像时，它会打开一个新的活动，如下所示，其中图像以全尺寸显示，并且有一个按钮将其设置为壁纸。我正在使用 Glide 库从 url 加载图片。请告诉我如何将其设置为 url 中的壁纸，因为您的应用程序会加载完整尺寸的图片，但每次单击按钮时都会崩溃。也许这是从 url 加载以太或将其设置为墙纸的问题。

import android.app.WallpaperManager;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

import com.bumptech.glide.Glide;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class Main2Activity extends AppCompatActivity {
    ImageView img;
private Bitmap theBitmap;
Button b;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    final Context c= getApplicationContext();
    setContentView(R.layout.activity_main2);
    b= (Button) findViewById(R.id.button);
    Intent i=getIntent();
    final String url=i.getStringExtra("picture");

    img= (ImageView) findViewById(R.id.imageView4);
    Glide.with(this).load(url).fitCenter()  .into(img);
    b.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
             theBitmap=getBitmapFromURL(url);
            WallpaperManager wallpaperManager = WallpaperManager.getInstance(getBaseContext());
            try {
                wallpaperManager.setBitmap(theBitmap);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    });


}
public static Bitmap getBitmapFromURL(String src) {
    try {
        URL url = new URL(src);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setDoInput(true);
        connection.connect();
        InputStream input = connection.getInputStream();
        Bitmap myBitmap = BitmapFactory.decodeStream(input);
        return myBitmap;
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    }
  }
}

我已将 AndroidManifest 中的权限设置为

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.SET_WALLPAPER" />

这是我按下“设置为墙纸”按钮时出现的错误：-

07-20 09:33:43.127 3024-3024/com.android.backgroundchooser E/AndroidRuntime: FATAL EXCEPTION: main
                                                                         Process: com.android.backgroundchooser, PID: 3024
                                                                         android.os.NetworkOnMainThreadException
                                                                             at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1273)
                                                                             at com.android.org.conscrypt.OpenSSLSocketImpl$SSLOutputStream.write(OpenSSLSocketImpl.java:755)
                                                                             at com.android.okhttp.okio.Okio$1.write(Okio.java:76)
                                                                             at com.android.okhttp.okio.AsyncTimeout$1.write(AsyncTimeout.java:155)
                                                                             at com.android.okhttp.okio.RealBufferedSink.flush(RealBufferedSink.java:221)
                                                                             at com.android.okhttp.internal.http.HttpConnection.flush(HttpConnection.java:141)
                                                                             at com.android.okhttp.internal.http.HttpTransport.finishRequest(HttpTransport.java:52)
                                                                             at com.android.okhttp.internal.http.HttpEngine.readNetworkResponse(HttpEngine.java:902)
                                                                             at com.android.okhttp.internal.http.HttpEngine.readResponse(HttpEngine.java:788)
                                                                             at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:443)
                                                                             at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:388)
                                                                             at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:231)
                                                                             at com.android.okhttp.internal.huc.DelegatingHttpsURLConnection.getInputStream(DelegatingHttpsURLConnection.java:210)
                                                                             at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java)
                                                                             at com.android.backgroundchooser.Main2Activity.getBitmapFromURL(Main2Activity.java:60)
                                                                             at com.android.backgroundchooser.Main2Activity$1.onClick(Main2Activity.java:42)
                                                                             at android.view.View.performClick(View.java:5204)
                                                                             at android.view.View$PerformClick.run(View.java:21156)
                                                                             at android.os.Handler.handleCallback(Handler.java:739)
                                                                             at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                             at android.os.Looper.loop(Looper.java:148)
                                                                             at android.app.ActivityThread.main(ActivityThread.java:5466)
                                                                             at java.lang.reflect.Method.invoke(Native Method)
                                                                             at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                             at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

如果有人可以建议在我使用棉花糖设备时是否存在权限问题，请也请。

非常感谢，提前。

4

1 回答 1

1

我发现当你点击按钮时，你在getBitmapFromURL方法中做了一些 http 连接。也许这就是你得到一个异常的原因，因为它不允许在主线程上做任何网络，否则你会得到android.os.NetworkOnMainThreadException.

尝试使用新线程来放入您的getBitmapFromURL方法。

检查您的日志后，它确实是一个NetworkOnMainThreadException.

您可以设置OnClickListener：

b.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                final Bitmap theBitmap=getBitmapFromURL(url);
                b.post(new Runnable(){
                    @Override
                    public void run() {
                        // I'm not sure whether these code work out the main thread, so I use a View.post
                        try {
                            WallpaperManager wallpaperManager = WallpaperManager.getInstance(getBaseContext());
                            wallpaperManager.setBitmap(theBitmap);
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                });
            }
        }).start();
    }
});
于 2016-07-20T03:25:58.243 回答