android中设置桌面壁纸

最新推荐文章于 2024-03-28 12:15:32 发布

原创最新推荐文章于 2024-03-28 12:15:32 发布 · 913 阅读

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本文介绍了一个Android应用案例，该应用允许用户通过随机选择颜色来改变设备桌面壁纸的颜色，并提供了详细的实现代码。此功能通过使用`WallpaperManager`类及`ImageView`组件实现。

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package com.example.androidapi.app;

import java.io.IOException;
import android.app.Activity;
import android.app.WallpaperManager;
import android.graphics.Color;
import android.graphics.PorterDuff;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

import com.example.androidapi.R;

public class SetWallpaperActivity extends Activity {
	
    final static private int[] mColors =
            {Color.BLUE, Color.GREEN, Color.RED, Color.LTGRAY, 
    		 Color.MAGENTA, Color.CYAN,Color.YELLOW, Color.WHITE};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.wallpaper_2);
        
        final WallpaperManager wallpaperManager = WallpaperManager.getInstance(this);
        //获取系统桌面壁纸
        final Drawable wallpaperDrawable = wallpaperManager.getDrawable();
        final ImageView imageView = (ImageView) findViewById(R.id.imageview);
        imageView.setDrawingCacheEnabled(true);
        imageView.setImageDrawable(wallpaperDrawable);

        Button randomize = (Button) findViewById(R.id.randomize);
        randomize.setOnClickListener(new OnClickListener() {
            public void onClick(View view) {
                int mColor = (int) Math.floor(Math.random() * mColors.length);
                wallpaperDrawable.setColorFilter(mColors[mColor], PorterDuff.Mode.MULTIPLY);
                //设置颜色
                imageView.setImageDrawable(wallpaperDrawable);
                imageView.invalidate();
            }
        });

        Button setWallpaper = (Button) findViewById(R.id.setwallpaper);
        setWallpaper.setOnClickListener(new OnClickListener() {
            public void onClick(View view) {
                try {
                	//将重新设置的颜色设置为桌面壁纸
                    wallpaperManager.setBitmap(imageView.getDrawingCache());
                    finish();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });
    }
}