安卓一键换壁纸

360手机有一个很赞的应用，没有界面，点击一下图标换一张壁纸，其他手机都没有看到这个功能。

vivo倒是有亮屏换锁屏壁纸。

1.无界面应用

https://blog.51cto.com/u_16213305/8503774

AndroidManifest.xml

主题改为不显示

<activity android:name=".MainActivity"android:theme="@android:style/Theme.NoDisplay">

安卓高版本报错：did not call finish() prior to onResume() completing

改成透明主题

<activity android:name=".MainActivity"android:theme="@android:style/Theme.Translucent.NoTitleBar.Fullscreen">

2.壁纸API

Bing每日壁纸: http://cn.bing.com/HPImageArchive.aspx?format=js&idx=0&n=1

3.下载壁纸

Android HttpURLConnection下载网络图片设置系统壁纸_Android_脚本之家

URL httpUrl = new URL(imgUrl);
HttpURLConnection conn = (HttpURLConnection) httpUrl.openConnection();
conn.setReadTimeout(5000);
conn.setRequestMethod("GET");
conn.setDoInput(true);
InputStream IS = conn.getInputStream();

4.数据转换为Bitmap

Bitmap bitmap = BitmapFactory.decodeStream(IS);

5.设置壁纸

10.9 WallpaperManager(壁纸管理器) · W3School 菜鸟笔记 Android 基础入门教程 · 看云

https://www.cnblogs.com/android-deli/p/10116723.html

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

WallpaperManager WM = WallpaperManager.getInstance(this);
WM.setBitmap(bitmap);

问题

1.Cleartext HTTP traffic to xxx not permitted

AndroidManifest.xml

<application....android:usesCleartextTraffic="true">

2.NetworkOnMainThreadException

网络进程要写在 new Thread 里。

3.锁屏和桌面同时改变

好像高版本安卓底层代码是这样设置的，而且锁屏亮屏自动切换壁纸会被关掉。

主要代码

MainActivity.java

package com.hty.wallpaper;import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.WallpaperManager;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.widget.Toast;import org.json.JSONObject;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);new Thread(api).start();}Thread api = new Thread() {@Overridepublic void run() {String surl = "http://cn.bing.com/HPImageArchive.aspx?format=js&idx=0&n=1";String s = Utils.getURLResponse(surl);try {JSONObject JO = new JSONObject(s);surl = "http://www.bing.com" + JO.getJSONArray("images").getJSONObject(0).getString("url");Log.e(Thread.currentThread().getStackTrace()[2] + "", surl);Bitmap bitmap = Utils.getBitmap(surl);Message message = new Message();message.what = 0;Bundle bundle = new Bundle();bundle.putParcelable("bitmap", bitmap);message.setData(bundle);handler.sendMessage(message);} catch (Exception e) {Log.e(Thread.currentThread().getStackTrace()[2] + "", e.toString());String sm =  e.toString();Message message = new Message();message.what = 1;message.obj = sm;handler.sendMessage(message);}}};@SuppressLint("HandlerLeak")Handler handler = new Handler() {public void handleMessage(Message msg) {switch (msg.what) {case 0:Bitmap bitmap = msg.getData().getParcelable("bitmap");WallpaperManager WM = WallpaperManager.getInstance(MainActivity.this);try {WM.setBitmap(bitmap);} catch (Exception e) {Log.e(Thread.currentThread().getStackTrace()[2] + "", e.toString());}finish();break;case 1:String s = (String) msg.obj;Toast.makeText(MainActivity.this, s, Toast.LENGTH_SHORT).show();break;}}};}

Utils.java

package com.hty.wallpaper;import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;public class Utils {static String getURLResponse(String surl) {HttpURLConnection connection = null;InputStream IS = null;String resultData = "";try {URL url = new URL(surl);connection = (HttpURLConnection) url.openConnection();//connection.setDoInput(true);//connection.setUseCaches(false);connection.setRequestMethod("GET");IS = connection.getInputStream();InputStreamReader ISR = new InputStreamReader(IS, StandardCharsets.UTF_8);BufferedReader BR = new BufferedReader(ISR);String inputLine;while ((inputLine = BR.readLine()) != null) {resultData += inputLine;}} catch (Exception e) {Log.e(Thread.currentThread().getStackTrace()[2] + "", e.toString());} finally {if (IS != null) {try {IS.close();} catch (Exception e) {Log.e(Thread.currentThread().getStackTrace()[2] + "", e.toString());}}if (connection != null) {connection.disconnect();}}return resultData;}//https://blog.csdn.net/wu8022/article/details/10310527static Bitmap getBitmap(String imageUrl) {Bitmap bitmap = null;try {URL url = new URL(imageUrl);HttpURLConnection conn = (HttpURLConnection) url.openConnection();InputStream IS = conn.getInputStream();bitmap = BitmapFactory.decodeStream(IS);} catch (Exception e) {Log.e(Thread.currentThread().getStackTrace()[2] + "", e.toString());}return bitmap;}}