Android 实现"透明屏幕"

梁开东 · 发表于 2017-5-12 15:15:55

我在 Google Play 上看到一个挺有意思的app:

Url : https://play.google.com/store/apps/details?id=com.m2c.studio.transparent.screen

看着有点酷的样子,试着实现一下.
最终实现效果
效果
实现步骤

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="con.song.wallpaper">
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.SET_WALLPAPER"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<service android:label="@string/app_name"
android:name=".CameraLiveWallpaper"
android:permission="android.permission.BIND_WALLPAPER">
<intent-filter>
<action android:name="android.service.wallpaper.WallpaperService" />
</intent-filter>
<meta-data android:name="android.service.wallpaper"
android:resource="@xml/livewallpaper" />
</service>
</application>
</manifest>

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在res下面新建一个xml文件夹然后新建一个livewallpaper.xml 内容如下：

<?xml version="1.0" encoding="utf-8"?>
<wallpaper
xmlns:android="http://schemas.android.com/apk/res/android"
android:thumbnail="@mipmap/ic_launcher"/>

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实现动态壁纸的LiveWallpaper.java:

package con.song.wallpaper;
import android.hardware.Camera;
import android.service.wallpaper.WallpaperService;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import java.io.IOException;
public class CameraLiveWallpaper extends WallpaperService {
// 实现WallpaperService必须实现的抽象方法
public Engine onCreateEngine() {
// 返回自定义的CameraEngine
return new CameraEngine();
}
class CameraEngine extends Engine implements Camera.PreviewCallback {
private Camera camera;
@Override
public void onCreate(SurfaceHolder surfaceHolder) {
super.onCreate(surfaceHolder);
startPreview();
// 设置处理触摸事件
setTouchEventsEnabled(true);
}
@Override
public void onTouchEvent(MotionEvent event) {
super.onTouchEvent(event);
// 时间处理:点击拍照,长按拍照
}
@Override
public void onDestroy() {
super.onDestroy();
stopPreview();
}
@Override
public void onVisibilityChanged(boolean visible) {
if (visible) {
startPreview();
} else {
stopPreview();
}
}
/**
* 开始预览
*/
public void startPreview() {
camera = Camera.open();
camera.setDisplayOrientation(90);
try {
camera.setPreviewDisplay(getSurfaceHolder());
} catch (IOException e) {
e.printStackTrace();
}
camera.startPreview();
}
/**
* 停止预览
*/
public void stopPreview() {
if (camera != null) {
try {
camera.stopPreview();
camera.setPreviewCallback(null);
// camera.lock();
camera.release();
} catch (Exception e) {
e.printStackTrace();
}
camera = null;
}
}
@Override
public void onPreviewFrame(byte[] bytes, Camera camera) {
camera.addCallbackBuffer(bytes);
}
}
}

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启动动态壁纸的MainActivity.java:

package con.song.wallpaper;
import android.Manifest;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
private static final int PERMISSIONS_REQUEST_CAMERA = 454;
private Context mContext;
static final String PERMISSION_CAMERA = Manifest.permission.CAMERA;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mContext = this;
findViewById(R.id.text)
.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
checkSelfPermission();
}
});
}
/**
* 检查权限
*/
void checkSelfPermission() {
if (ContextCompat.checkSelfPermission(mContext, PERMISSION_CAMERA) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this,
new String[]{PERMISSION_CAMERA},
PERMISSIONS_REQUEST_CAMERA);
} else {
// setTransparentWallpaper();
startWallpaper();
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode) {
case PERMISSIONS_REQUEST_CAMERA: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// setTransparentWallpaper();
startWallpaper();
} else {
Toast.makeText(mContext, getString(R.string._lease_open_permissions), Toast.LENGTH_SHORT).show();
}
return;
}
}
}
/**
* 选择壁纸
*/
void startWallpaper() {
final Intent pickWallpaper = new Intent(Intent.ACTION_SET_WALLPAPER);
Intent chooser = Intent.createChooser(pickWallpaper, getString(R.string.choose_wallpaper));
startActivity(chooser);
}
/**
* 不需要手动启动服务
*/
void setTransparentWallpaper() {
startService(new Intent(mContext, CameraLiveWallpaper.class));
}
}

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这样一个简单装逼神器出来了...