我知道无法停止或覆盖主页按钮。有没有办法以某种方式扩展主页按钮，然后当它被点击时，我的计数器应该增加而不会干扰主页按钮的任何功能。
最佳答案
希望这对你有帮助。您应该为此使用服务和广播接收器。
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>
关于android - 我们可以在 android 中单击主页按钮时添加一个计数器吗？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/43198159/