开机时自动启动Android应用

如果需要在Android开机时自动启动应用程序，可以通过响应android.intent.action.BOOT_COMPLETED广播消息来实现， Android系统启动结束时，会发出 android.intent.action.BOOT_COMPLETED 消息。具体步骤如下：

1. 定义一个Broadcast Receiver

package kexc.boot;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class BootReciever extends BroadcastReceiver {
private final String action = "android.intent.action.BOOT_COMPLETED";

@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(action)) {
Toast.makeText(context, "HI, Activity is auto started when boot complete.", Toast.LENGTH_LONG).show();
intent = new Intent();
intent.setClass(context, BootStartActivity.class);
//Intent.FLAG_ACTIVITY_NEW_TASK. This flag is generally used by activities that want to present a "launcher" style behavior
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
}
}

}

注意：intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);一定要写上。

//Intent.FLAG_ACTIVITY_NEW_TASK. This flag is generally used by activities that want to present a "launcher" style behavior

当从BroadcaseReceiver或service去启动一个Activity时，Intent.flag必须为FLAG_ACTIVITY_NEW_TASK。

2. 定义一个Activity

package kexc.boot;

import android.app.Activity;
import android.app.KeyguardManager;
import android.app.KeyguardManager.KeyguardLock;
import android.content.Context;
import android.os.Bundle;

public class BootStartActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//屏幕解锁
KeyguardManager keyManager = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
KeyguardLock lock = keyManager.newKeyguardLock(Context.KEYGUARD_SERVICE);
lock.disableKeyguard();

setContentView(R.layout.main);
}
}

3.Manifest文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="kexc.boot"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk android:minSdkVersion="8" />

<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:label="@string/app_name"
android:name=".BootStartActivity" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver
android:name=".BootReciever" android:permission="android.permission.RECEIVE_BOOT_COMPLETED">
<intent-filter >
<action android:name="android.intent.action.BOOT_COMPLETED" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</receiver>
</application>
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.DISABLE_KEYGUARD" />
</manifest>

注意：Broadcast Receiver的category必须是android.intent.category.DEFAULT。android.intent.category.DEFAULT：用于隐式Intent(Implicit Intent) 启动没有明确的指定Activity。

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