如何在屏幕锁定之前调用活动?

时间:2014-03-26 10:06:30

标签: android

我想在重新启动后屏幕锁定之前启动一项活动。这是我的代码

  <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
  <uses-permission android:name="android.permission.WAKE_LOCK" />
  <uses-permission android:name="android.permission.DISABLE_KEYGUARD" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="com.example.bootservicestartup.MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <receiver android:name=".BootUpReceiver">

        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED" />
            <action android:name="android.intent.category.DEFAULT"/>
        </intent-filter>

    </receiver>


</application>

public class BootUpReceiver extends BroadcastReceiver {

@SuppressLint("InlinedApi")
@Override
public void onReceive(Context context, Intent intent) {
    // TODO Auto-generated method stub

    Intent i = new Intent(context, MainActivity.class);
    i.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
    i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    context.startActivity(i);

}

代码的作用是重新启动手机时,会显示一项活动。这样可行。但我也希望在显示屏幕锁定之前显示活动。

1 个答案:

答案 0 :(得分:0)

希望如果您将其作为服务来帮助您;

您需要AndroidManifest.xml文件中的以下内容:

1)在你的元素中:

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

2)在你的元素中(确保为BroadcastReceiver使用完全限定的[或相对]类名称):

<receiver android:name="com.example.MyBroadcastReceiver">  
    <intent-filter>  
        <action android:name="android.intent.action.BOOT_COMPLETED" />  
    </intent-filter>  
</receiver>

(你不需要android:启用,导出等属性...... Android默认值是正确的)

在MyBroadcastReceiver.java中:

package com.example;

public class MyBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Intent startServiceIntent = new Intent(context, MyService.class);
        context.startService(startServiceIntent);
    }
}