不需要權(quán)限
講解部分:
http://blog.csdn.net/working_harder/article/details/52629919
代碼實現(xiàn)
Mainnifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.ruulai.tools">
<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" android:theme="@style/MainActivityTheme">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service
android:name=".MyService"
android:enabled="true"
android:exported="true"></service>
<!-- 我們無法監(jiān)聽Home按鍵, 但是可以改變因Home進入后臺時的處理, 比如在Manifest的activity聲明中加上android:noHistory="true"
這樣如果用戶通過Home按鍵讓我們的應(yīng)用進入后臺, 我們會讓這個activity銷毀, 就像我們被滑動關(guān)閉一樣.
如果不加, 最好重寫Activity的onNewIntent來應(yīng)對 因Home 進入后臺, 然后Service再次啟動 鎖屏Activity 的情況. -->
<activity android:excludeFromRecents="true"
android:noHistory="true"
android:exported="false"
android:launchMode="singleInstance"
android:name=".LockScreenActivity"
android:screenOrientation="portrait"
android:taskAffinity="com.ruulai.tools.LockScreenActivity"
android:theme="@style/MyTheme">
</activity>
<!--
上面的屬性中android:excludeFromRecents="true"讓鎖屏Activity不顯示在近期任務(wù)中,
android:launchMode="singleInstance"和android:taskAffinity="com.package.name.lockscreen"保證鎖屏Activity有一個單獨的Task, 且這個Task里永遠只有它一個實例.
-->
</application>
</manifest>
主題 style.xml
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
<style name="MainActivityTheme" parent="AppTheme">
<!--我們的鎖屏Activity在滑動”解鎖”之后, 理論上是直接進入下面的界面, 但有時如果下面不是launcher, 而是一個app, 有可能會閃一下黑屏, 這個其實是底下activity的入場動畫導(dǎo)致的, 某些Android版本會對頂部activity透明時處理有些奇怪, 我們不能保證其他的應(yīng)用不閃黑屏, 但是對自己的的應(yīng)用還是可以的, 只需要在我們的主體activity的style中加上 -->
<item name="android:windowAnimationStyle">@null</item>
</style>
<style name="MyTheme" parent="AppTheme">
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowBackground">@android:color/transparent</item>
<item name="android:colorBackgroundCacheHint">@null</item>
<item name="android:windowNoTitle">true</item>
<item name="android:backgroundDimEnabled">false</item>
<item name="android:windowAnimationStyle">@null</item>
<item name="android:windowContentOverlay">@null</item>
</style>
</resources>
Service
package com.ruulai.tools;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;
public class MyService extends Service {
private BroadcastReceiver broadcastReceiver;
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
super.onCreate();
broadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
Toast.makeText(MyService.this, "收到鎖屏消息", Toast.LENGTH_SHORT).show();
if (action.equals(Intent.ACTION_SCREEN_OFF)) {
Intent lockscreen = new Intent(MyService.this, LockScreenActivity.class);
lockscreen.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); // ------->
startActivity(lockscreen);
Toast.makeText(MyService.this, "啟動鎖屏Activity", Toast.LENGTH_SHORT).show();
}
}
};
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(Intent.ACTION_SCREEN_OFF);
registerReceiver(broadcastReceiver, intentFilter);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.d("MyService", "Service Start");
return START_NOT_STICKY;
}
}
鎖屏Activity
package com.ruulai.tools;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.WindowManager;
import android.widget.Toast;
public class LockScreenActivity extends AppCompatActivity{
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD |
WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
setContentView(R.layout.lock);
}
@Override
public void onBackPressed() {
// 鎖屏界面當(dāng)然不響應(yīng)Back按鍵, 只需要重寫Activity的onBackPressed方法即可
}
public void test(View view) {
Toast.makeText(this, "你點擊了Test", Toast.LENGTH_SHORT).show();
}
@Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
}
}
MainActivity
package com.ruulai.tools;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void open(View view) {
Intent intent = new Intent();
intent.setClass(this, MyService.class);
startService(intent);
}
}
