问题
I know that home button cannot be stopped or override. Is there a way to extend the home button in a way then when it is click, my counter should be increasing without disturbing any functionality of the home button.
回答1:
Try the following code, it works:
HomeWatcher mHomeWatcher = new HomeWatcher(this);
mHomeWatcher.setOnHomePressedListener(new OnHomePressedListener() {
@Override
public void onHomePressed() {
// do something here...
}
@Override
public void onHomeLongPressed() {
}
});
mHomeWatcher.startWatch();
HomeWatcher Class
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.util.Log;
public class HomeWatcher {
static final String TAG = "hg";
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);
}
public void setOnHomePressedListener(OnHomePressedListener listener) {
mListener = listener;
mRecevier = new InnerRecevier();
}
public void startWatch() {
if (mRecevier != null) {
mContext.registerReceiver(mRecevier, mFilter);
}
}
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.e(TAG, "action:" + action + ",reason:" + reason);
if (mListener != null) {
if (reason.equals(SYSTEM_DIALOG_REASON_HOME_KEY)) {
mListener.onHomePressed();
} else if (reason.equals(SYSTEM_DIALOG_REASON_RECENT_APPS)) {
mListener.onHomeLongPressed();
}
}
}
}
}
}
}
OnHomePressed Interface
public interface OnHomePressedListener {
public void onHomePressed();
public void onHomeLongPressed();
}
回答2:
May this helps you. You should have to use the service and broadcast receiver for that.
MainActivty.java
public class MainActivity extends AppCompatActivity {
private Button btn_startservice;
private Button btn_stopservice;
private TextView tv_servicecounter;
ServiceDemo myService;
boolean isBound;
BroadcastReceiver broadcastRec = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
int datapassed = intent.getIntExtra("value", 0);
tv_servicecounter.setText(String.valueOf(datapassed));
}
};
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv_servicecounter = (TextView) findViewById(R.id.tv_activity_main_count);
btn_startservice = (Button) findViewById(R.id.btn_activity_main_startservices);
btn_stopservice = (Button) findViewById(R.id.btn_activity_main_stopservices);
btn_startservice.setOnClickListener(
new View.OnClickListener() {
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR1)
@Override
public void onClick(View v) {
Intent objIntent = new Intent(MainActivity.this, ServiceDemo.class);
if (!isBound) {
bindService(objIntent, myConnection, Context.BIND_AUTO_CREATE);
isBound = true;
startService(objIntent);
} else {
isBound = false;
unbindService(myConnection);
}
}
}
);
btn_stopservice.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent objIntent = new Intent(MainActivity.this, ServiceDemo.class);
if (isBound) {
isBound = false;
unbindService(myConnection);
stopService(objIntent);
} else {
stopService(objIntent);
}
}
}
);
}
@Override
protected void onResume() {
registerReceiver(broadcastRec, new IntentFilter("USER_ACTION"));
super.onResume();
}
@Override
protected void onStop() {
this.unregisterReceiver(broadcastRec);
super.onStop();
}
private ServiceConnection myConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName className,
IBinder service) {
myService = ((ServiceDemo.MyLocalBinder) service).getService();
isBound = true;
}
public void onServiceDisconnected(ComponentName arg0) {
isBound = false;
}
};
@Override
protected void onDestroy() {
super.onDestroy();
if (isBound) {
unbindService(myConnection);
isBound = false;
}
}
}
DemoService.java
public class ServiceDemo extends Service {
int i;
private MyThread mythread;
public boolean isRunning = false;
Notification notification;
@Override
public void onCreate() {
super.onCreate();
Log.d(TAG, "onCreate");
mythread = new MyThread();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Toast.makeText(this, "Service Started", Toast.LENGTH_SHORT).show();
if (!isRunning) {
mythread.start();
isRunning = true;
}
return START_STICKY;
}
@Override
public void onDestroy() {
super.onDestroy();
mythread.interrupt();
Toast.makeText(this, "Service Destroyed", Toast.LENGTH_SHORT).show();
}
public void sendBrodcastMsg(int value) {
Intent intent = new Intent();
intent.setAction("USER_ACTION");
intent.putExtra("value", value);
sendBroadcast(intent);
}
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)
class MyThread extends Thread {
static final long DELAY = 100;
@Override
public void run() {
while (isRunning) {
try {
i++;
Thread.sleep(DELAY);
sendBrodcastMsg(i);
shownotification();
} catch (InterruptedException e) {
isRunning = false;
e.printStackTrace();
}
}
stopSelf();
}
}
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)
public void shownotification() {
Intent in = new Intent(this, MainActivity.class);
PendingIntent pIntent = PendingIntent.getActivity(this, (int) System.currentTimeMillis(), in, 0);
notification = new NotificationCompat.Builder(this)
.setContentTitle(String.valueOf(i))
.setContentText(String.valueOf(i))
.setSmallIcon(R.drawable.musicplayer)
.setContentIntent(pIntent)
.setAutoCancel(true).build();
;
startForeground(101, notification);
}
public class MyLocalBinder extends Binder {
ServiceDemo getService() {
return ServiceDemo.this;
}
}
private final IBinder myBinder = new MyLocalBinder();
@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return myBinder;
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.yudiz.servicedemo.MainActivity">
<TextView
android:id="@+id/tv_activity_main_count"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="ABC"
android:gravity="center"/>
<Button
android:id="@+id/btn_activity_main_startservices"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/tv_activity_main_count"
android:text="Start Services"/>
<Button
android:id="@+id/btn_activity_main_stopservices"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/btn_activity_main_startservices"
android:text="Stop Services" />
</RelativeLayout>
Androidmanifest.xml
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service
android:name=".ServiceDemo"
android:enabled="true">
</service>
</application>
回答3:
You can create a new Home screen Activity (ACTION_MAIN with category CATEGORY_HOME), count the number of Intents (Home) received and then perhaps start the real Home.
来源：https://stackoverflow.com/questions/43198159/can-we-add-a-counter-when-home-button-is-clicked-in-android