為了大家少走彎路,也是為了相互交流,多結識一些朋友!我在這裡貼出來:android手機上的一鍵鎖屏程式具體代碼及注意的問題,
下面就以我的工程為例進行詳細說明:
工程結構
LockScreen.java
package com.app;
import android.app.Activity;
import android.app.admin.DeviceAdminReceiver;
import android.app.admin.DevicePolicyManager;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
public class LockScreen extends DeviceAdminReceiver {
static final int RESULT_ENABLE = 1;
public static class Controller extends Activity {
DevicePolicyManager mDPM;
ComponentName mDeviceAdminSample;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//首先我們要獲得android裝置管理代理
mDPM = (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);
//LockScreen 繼承自 DeviceAdminReceiver
mDeviceAdminSample = new ComponentName(Controller.this,
LockScreen.class);
//得到當前裝置管理員有沒有啟用
boolean active = mDPM.isAdminActive(mDeviceAdminSample);
if (!active) {
//如果沒有啟用的話,就去提示使用者啟用(第一次運行程式時)
getAdmin();
}else{
//如果已經啟用的話,就執行立即鎖屏
mDPM.lockNow();
}
// killMyself ,鎖屏之後就立即kill掉我們的Activity,避免資源的浪費;
android.os.Process.killProcess(android.os.Process.myPid());
}
public void getAdmin() {
// Launch the activity to have the user enable our admin.
Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN,
mDeviceAdminSample);
intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,
startActivityForResult(intent, RESULT_ENABLE);
}
}
}
上面就是整個應用程式的核心代碼及簡單邏輯,下面就是相關設定檔
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.app"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="8" />
<application android:label="@string/app_name"
android:icon="@drawable/icon" >
<activity android:name=".LockScreen$Controller" android:theme="@android:style/Theme.Translucent">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name=".LockScreen"
android:permission="android.permission.BIND_DEVICE_ADMIN">
<meta-data android:name="android.app.device_admin"
android:resource="@xml/device_admin_sample" />
<intent-filter>
<action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
</intent-filter>
</receiver>
</application>
</manifest>
在這個檔案裡有一個非常重要的屬性,<activity android:name=".LockScreen$Controller"android:theme="@android:style/Theme.Translucent">這個裡面的 android:theme="@android:style/Theme.Translucent",是設定應用程式透明,
這樣就不會出現當我們鎖屏時會出現閃屏,至於為什麼閃屏大家執行程式後就會明白了
device_admin_sample.xml
<?xml version="1.0" encoding="utf-8"?>
<device-admin xmlns:android="http://schemas.android.com/apk/res/android">
<uses-policies>
<force-lock />
</uses-policies>
</device-admin>