一键清除SD卡数据

1、Activity中锁屏的代码实现

import android.app.Activity;
import android.app.admin.DevicePolicyManager;
import android.content.ComponentName;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;

public class MainActivity extends Activity {

private DevicePolicyManager dpm;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_main);
dpm = (DevicePolicyManager) getSystemService(DEVICE_POLICY_SERVICE);
wipedata(null);
}

/**
* @param v
* 一键清除SD卡数据
*/
public void wipedata(View v){

//如果没有激活设备管理员，提醒给用户做事
ComponentName who = new ComponentName(this, DeviceAdminSample.class);
if (dpm.isAdminActive(who)) {//true
//清除sd数据
dpm.wipeData(DevicePolicyManager.WIPE_EXTERNAL_STORAGE);
finish();
} else {

Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, who);
intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,
"设备管理器，，，，，，，，，，，，，，，，");
startActivityForResult(intent, 1);
}

// 取消激活设备管理
//DevicePolicyManager dpm = (DevicePolicyManager) getSystemService(DEVICE_POLICY_SERVICE);
//ComponentName who = new ComponentName(this, DeviceAdminSample.class);
//dpm.removeActiveAdmin(who);//取消激活管理设备
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}

2、设备管理员接收者类的实现

import android.app.admin.DeviceAdminReceiver;
public class DeviceAdminSample extends DeviceAdminReceiver {

}

3、在清单文件中声明设备管理员接收者

<receiver
android:name="com.lqr.lockscreen.DeviceAdminSample"
android:description="@string/sample_device_admin_description"
android:label="@string/sample_device_admin"
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>

4、在res目录下新建xml文件夹，创建一个device_admin_sample.xml文件，内容如下：

<device-admin xmlns:android="http://schemas.android.com/apk/res/android">
<uses-policies>
<limit-password />
<watch-login />
<reset-password />
<force-lock />
<wipe-data />
<expire-password />
<encrypted-storage />
<disable-camera />
</uses-policies>
</device-admin>

5、string.xml内容如下：

<resources>
<string name="app_name">一键清除SD卡数据</string>
<string name="action_settings">Settings</string>
<string name="hello_world">Hello world!</string>
<string name="activity_sample_device_admin">设备管理员</string>
<string name="sample_device_admin">管理员</string>
<string name="sample_device_admin_description">开启设备管理员，这是设备器中的描述</string>
</resources>