Question

我的项目中有一个Imageview和一个按钮，我希望按钮将图像设置为主屏幕背景，但我收到错误“imageView”无法在行中解析“Bitmap bitmap =（（BitmapDrawable）imageView.getDrawable （））getBitmap（）;”。

package com.example.androidhive;

import java.io.IOException;

import android.app.Activity;
import android.app.WallpaperManager;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;

 public class FullImageActivity extends Activity {

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

    // get intent data
    Intent i = getIntent();

    // Selected image id
    int position = i.getExtras().getInt("id");
    ImageAdapter imageAdapter = new ImageAdapter(this);

    ImageView imageView = (ImageView) findViewById(R.id.full_image_view);
    imageView.setImageResource(imageAdapter.mThumbIds[position]);
    }


 public void setaswall(View view) { // SET AS WALLPAPER BUTTON
     // TODO Auto-generated method stub
     WallpaperManager myWallpaperManager
      = WallpaperManager.getInstance(getApplicationContext());
     try {
      Bitmap bitmap=((BitmapDrawable)imageView.getDrawable()).getBitmap();
      if(bitmap!=null)
      myWallpaperManager.setBitmap(bitmap);
     } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
     }
  }
 };
 public void setaswall(View view) { // SET AS WALLPAPER BUTTON
     WallpaperManager myWallpaperManager 
     = WallpaperManager.getInstance(getApplicationContext());
     };
  }

Answer 1

您必须将imageView声明为全局，因此当您在setaswall（View视图）上使用它时，您可以将其设置在范围内，而不是仅在onCreate（）中创建它

像这样：

public class FullImageActivity extends Activity {

private ImageView _imageView;

@Override
public void onCreate(Bundle savedInstanceState) {

然后，在setaswall（查看视图）上：

    Bitmap bitmap=((BitmapDrawable)_imageView.getDrawable()).getBitmap();
        if(bitmap!=null)
            myWallpaperManager.setBitmap(bitmap);

从imageView获取id并将图像设置为Wallpaper Onclick

1 个答案: