Android开发-监听系统的 home键
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关于监听home键的方法,在网上找的资料,自己整理了一下
方法一:
这种方法是再次启动应用程序时会执行到(切后台后,再次唤起时)
在AndroidManifest.xml 里相应的Activity里加上 android:launchMode = "singleTask"
在Activity代码里重载
@Override
protected void onNewIntent(Intent intent) {
// TODO Auto-generated method stub
//从后台切回来的时候执行
Log.i(TAG, "*******onNewIntent");
super.onNewIntent(intent);
}
以下两种方法是按下home键时执行
方法二:
这种方法可能会受sdk版本的限制,请注意
在Activity代码里重载以下两个方法
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(KeyEvent.KEYCODE_HOME==keyCode){//要执行的动作或者任务
Log.i(TAG,"onKeyDown KEYCODE_HOME ");}
return super.onKeyDown(keyCode, event);
}@Override
public void onAttachedToWindow(){
this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
super.onAttachedToWindow();
}
方法三:
这种方法挺适用的,在2.3,4.0都适用,请采用
现在把源码放上
1. HomeWatcherActivity .java
package com.android.demos.activity;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import com.android.demos.interfaces.*;
import com.android.demos.utils.HomeWatcher;
public class HomeWatcherActivity extends Activity {
private final String TAG = "HomeWatcherActivity";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
HomeWatcher mHomeWatcher = new HomeWatcher(this);
mHomeWatcher.setOnHomePressedListener(new OnHomePressedListener() {
@Override
public void onHomePressed() {
Log.i(TAG, "onHomePressed");
}
@Override
public void onHomeLongPressed() {
Log.i(TAG, "onHomeLongPressed");
}
});
mHomeWatcher.startWatch();
}
}
2. OnHomePressedListener .java
package com.android.demos.interfaces;
public interface OnHomePressedListener {
public void onHomePressed();
public void onHomeLongPressed();
}
3. HomeWatcher .java
package com.android.demos.utils;
import com.android.demos.interfaces.OnHomePressedListener;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.util.Log;
/**
* watch the HOME key pressed, we only listen the HOME pressed <b>NOT Intercept
* </b>this pressed.<br>
* Tips:invoke {@link #startWatch()} in activity's onResume method and
* {@link #stopWatch()} in activity's onStop Method.
*
* @author
*/
public class HomeWatcher {
static final String TAG = "HomeWatcher";
private Context mContext;
private IntentFilter mFilter;
private OnHomePressedListener mListener;
private InnerRecevier mRecevier;
public HomeWatcher(Context context) {
mContext = context;
mFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
}
/**
* set the home pressed listener, if set will callback the home pressed
* listener's method when home pressed.
*
* @param listener
*/
public void setOnHomePressedListener(OnHomePressedListener listener) {
mListener = listener;
mRecevier = new InnerRecevier();
}
/**
* start watch
*/
public void startWatch() {
if (mRecevier != null) {
mContext.registerReceiver(mRecevier, mFilter);
}
}
/**
* stop watch
*/
public void stopWatch() {
if (mRecevier != null) {
mContext.unregisterReceiver(mRecevier);
}
}
class InnerRecevier extends BroadcastReceiver {
final String SYSTEM_DIALOG_REASON_KEY = "reason";
final String SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS = "globalactions";
final String SYSTEM_DIALOG_REASON_RECENT_APPS = "recentapps";
final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {
String reason = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY);
if (reason != null) {
Log.i(TAG, "receive action:" + action + ",reason:" + reason);
if (mListener != null) {
if (reason.equals(SYSTEM_DIALOG_REASON_HOME_KEY)) {
//home键
mListener.onHomePressed();
} else if (reason
.equals(SYSTEM_DIALOG_REASON_RECENT_APPS)) {
//长按home键
mListener.onHomeLongPressed();
}
}
}
}
}
}
方法四:自己管理应用程序的activity状态,用一个全局变量来控制
}
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