2

ユーザーがボタンをクリックして画像を壁紙として設定できるアプリを作成したいと考えています。この画像は URL に配置され、壁紙の設定は AsyncTask を介して実行されます。このビデオに示されている手順に従いました: https://www.youtube.com/watch?v=JeA8Z8dtD10しかし、うまくいきません。アプリにはボタンが表示されますが、クリックすると何かが起こります。

コードは次のとおりです。

package com.example.myapplication4;

import android.app.Activity;
import android.app.ProgressDialog;
import android.app.WallpaperManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

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

import javax.net.ssl.HttpsURLConnection;

public class MainActivity extends Activity {

public ProgressDialog progressDialog;

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

    Button btnSetWallpaper = (Button) findViewById(R.id.button);

    btnSetWallpaper.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            String urlImage ="https://www.geektopia.es/storage/geek/posts/2015/08/17/marshmallow.jpg";
            new SetWallpaperTask().equals(urlImage);

        }
    });
}

public InputStream OpenHttpConnection (String urlString)
throws IOException
{
    InputStream in = null;
    int response = -1;
    URL url = new URL (urlString);
    URLConnection conn = url.openConnection();

    if (!(conn instanceof HttpsURLConnection)) {
        throw new IOException("Not an HTTP connection");
    }

    try {
        HttpsURLConnection httpCon = (HttpsURLConnection)conn;
        httpCon.setInstanceFollowRedirects(true);
        httpCon.setRequestMethod("Get");
        httpCon.connect();
        response = httpCon.getResponseCode();
        if (response == HttpsURLConnection.HTTP_OK) {
            in = httpCon.getInputStream();
        }
    }catch (Exception ex) {
        throw new IOException("Error connecting...");
    }
    return in;
}

public Bitmap DecodeStream (String url) {
    Bitmap bitmap = null;
    InputStream in = null;
    try {
        in = OpenHttpConnection(url);
        bitmap = BitmapFactory.decodeStream(in);
        in.close();
    }
    catch (IOException e) {
        Toast.makeText(this, e.getLocalizedMessage(), Toast.LENGTH_SHORT).show();
    }
    return bitmap;
}

public class SetWallpaperTask extends AsyncTask <String, Void, Bitmap> {

    @Override
    protected Bitmap doInBackground(String... params) {

        Bitmap bitmap = DecodeStream(params[0]);
        return bitmap;
    }

    @Override
    protected void onPostExecute (Bitmap result) {
        super.onPostExecute(result);

        WallpaperManager wallpaperManager = WallpaperManager.getInstance(getBaseContext());
        try {
            wallpaperManager.setBitmap(result);
            progressDialog.dismiss();
            Toast.makeText(getApplicationContext(), "Set wallpaper successfully", Toast.LENGTH_SHORT).show();


        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }

    @Override
    protected void onPreExecute () {
        super.onPreExecute();

        progressDialog = new ProgressDialog(MainActivity.this);
        progressDialog.setMessage("Please wait...");
        progressDialog.setCancelable(false);
        progressDialog.show();
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    return super.onCreateOptionsMenu(menu);
}
}

編集：

public class MainActivity extends Activity {

public ProgressDialog progressDialog;

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

    Button btnSetWallpaper = (Button) findViewById(R.id.button);

    btnSetWallpaper.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            new SetWallpaperTask();
        }
    });
}

public class SetWallpaperTask extends AsyncTask <String, Void, Bitmap> {

    @Override
    protected Bitmap doInBackground(String... params) {
        Bitmap result= null;
        try {
            result = Picasso.with(getApplicationContext())
                    .load("https://www.geektopia.es/storage/geek/posts/2015/08/17/marshmallow.jpg")
                    .get();
        } catch (IOException e) {
            e.printStackTrace();
        }

        WallpaperManager wallpaperManager = WallpaperManager.getInstance(getApplicationContext());
        try {
            wallpaperManager.setBitmap(result);
        } catch (IOException ex) {
            ex.printStackTrace();
        }
        return result;
    }

    @Override
    protected void onPostExecute (Bitmap result) {
        super.onPostExecute(result);

        WallpaperManager wallpaperManager = WallpaperManager.getInstance(getBaseContext());
        try {
            wallpaperManager.setBitmap(result);
            progressDialog.dismiss();
            Toast.makeText(getApplicationContext(), "Set wallpaper successfully", Toast.LENGTH_SHORT).show();
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }

    @Override
    protected void onPreExecute () {
        super.onPreExecute();

        progressDialog = new ProgressDialog(MainActivity.this);
        progressDialog.setMessage("Please wait...");
        progressDialog.setCancelable(false);
        progressDialog.show();
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    return super.onCreateOptionsMenu(menu);
}
}

また、マニフェストに INTERNET および SET_WALLPAPER 権限を追加しました。エラーがどこにあるか知っていますか？どうもありがとう ：）

4

3 に答える 3

2

URL からビットマップを取得するには Picasso ライブラリが必要です
。 最新のライブラリを追加するにはhttps://github.com/square/picasso

String url ="https://..."
Target target = new Target() {
    @Override
    public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
        Log.e(TAG, "OnBitmapLoaded");
        WallpaperManager wallpaperManager = WallpaperManager.getInstance(BroadcastService.this);
        try {
            wallpaperManager.setBitmap(bitmap);
        } catch (IOException e) {
            e.printStackTrace();
            Log.e(TAG, "IOException->" + e.getMessage());
        }
    }

    @Override
    public void onBitmapFailed(Exception e, Drawable errorDrawable) {
        Log.e(TAG, "" + e.getMessage());
    }

    @Override
    public void onPrepareLoad(Drawable placeHolderDrawable) {
        Log.e(TAG, "OnPrepareLoad");
    }
};
Picasso.get().load(url).into(target);
于 2019-08-27T04:39:57.960 に答える