所以我一直在为Android开发一个锁屏应用程序，我已经完成了大部分工作，并且响应非常快。我现在面临的问题是，每当我关闭应用程序并锁定手机并在下一刻解锁时，Lockscreen活动会很晚或根本不显示。
我使用了不同的锁屏应用来检查这种延迟，并且AcDisplay面临同样的问题。 虽然Next Lockscreen（微软）没有。据我所知，它故意延迟屏幕唤醒直到锁屏活动被充气。
因此，如果有人能告诉我如何消除这种延迟或延迟屏幕唤醒，就像Next一样，这将非常有用。
修改
我尝试在LockscreenActivity上使用android：alwaysRetainTaskState =“true”
LockscreenActivity.java
package com.bikimax.lockscreen;
import java.util.Calendar;
import android.app.Activity;
import android.app.WallpaperManager;
import android.content.Context;
import android.content.SharedPreferences;
import android.graphics.PixelFormat;
import android.graphics.Typeface;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.Handler;
import android.os.Vibrator;
import android.preference.PreferenceManager;
import android.support.v4.view.GestureDetectorCompat;
import android.telephony.PhoneStateListener;
import android.support.v4.*;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.view.GestureDetector;
import android.view.GestureDetector.OnDoubleTapListener;
import android.view.GestureDetector.OnGestureListener;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import com.bikimax.lockscreen.util.DigitalClock;
import com.bikimax.lockscreen.util.TimeMap;
public class LockscreenActivity extends Activity{
Drawable wallpaper;
Calendar cal;
ImageView background;
WindowManager winManager;
RelativeLayout layout;
View aView;
Button button;
private static Handler handler;
Vibrator vibra;
boolean bWallpaperEnabled;
boolean btextClockEnabled;
SharedPreferences SP;
@Override
protected void onCreate(Bundle savedInstanceState) {
Log.i("Daze", "Lockscreen Activity Created");
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_lockscreen);
SP = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
boolean bWallpaperEnabled = SP.getBoolean("wallpaperEnable",false);
WindowManager.LayoutParams localLayoutParams = new WindowManager.LayoutParams( WindowManager.LayoutParams.TYPE_SYSTEM_ERROR,
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE|
WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL|
WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH|
WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN|
View.SYSTEM_UI_FLAG_LAYOUT_STABLE|
View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION|
View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN|
View.SYSTEM_UI_FLAG_HIDE_NAVIGATION|
View.SYSTEM_UI_FLAG_FULLSCREEN,
PixelFormat.TRANSLUCENT);
winManager = ((WindowManager)getApplicationContext().getSystemService(WINDOW_SERVICE));
layout = new RelativeLayout(getApplicationContext());
getWindow().setAttributes(localLayoutParams);
View.inflate(this, R.layout.activity_lockscreen, this.layout);
this.winManager.addView(layout, localLayoutParams);
// mDetector = new GestureDetector(this,this);
// myThread = null;
// Thread myThread = null;
// Runnable myRunnableThread = new CountDownRunner();
// myThread = new Thread(myRunnableThread);
// myThread.start();
//Fonts
final Typeface OpenSans = Typeface.createFromAsset(getAssets(), "fonts/OpenSans/OpenSans-Light.ttf"); // size: 27dp
final Typeface Alcubierre = Typeface.createFromAsset(getAssets(), "fonts/Alcubierre.otf"); // numeral size: 40dp
getApplicationContext();
TelephonyManager TelephonyMgr = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
TelephonyMgr.listen(new TeleListener(),PhoneStateListener.LISTEN_CALL_STATE);
WallpaperManager myWallpaperManager = WallpaperManager.getInstance(getApplicationContext());
button = (Button) layout.findViewById(R.id.button1);
button.setTypeface(OpenSans);
background = (ImageView) layout.findViewById(R.id.imageView1);
if(bWallpaperEnabled == true){
background.setBackground(myWallpaperManager.getDrawable());
background.getBackground().setColorFilter(0x7f000000, android.graphics.PorterDuff.Mode.DARKEN);
}
handler = new Handler();
Runnable updateCurrentTime = new Runnable(){
@Override
public void run()
{
SP = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
btextClockEnabled = SP.getBoolean("textClockEnable",false);
cal = Calendar.getInstance();
String digitalClock = DigitalClock.createTimeString(cal.get(Calendar.MINUTE), cal.get(Calendar.HOUR));
String textClock = TimeMap.createTimeString(cal.get(Calendar.MINUTE),cal.get(Calendar.HOUR_OF_DAY));
if(btextClockEnabled == true){
button.setTypeface(OpenSans);
button.setText(textClock);
}
else{
button.setTextSize(40);
button.setTypeface(Alcubierre);
button.setText(digitalClock);
} // Update the current Time
handler.postDelayed(this,1000); // Run this again in 1 second
// (i.e. we create an infinite loop that
// executes every second)
}
};
handler.postDelayed(updateCurrentTime,1); // The first call to the
// updateCurrentTime Runnable with
// a 5 second delay
Log.i("Daze","Lockscreen Activity Set Up");
}
public void unlock(){
finish();
System.exit(0);
}
public void onUnlock(View view){
Log.i("Daze", "Unlock Button Pressed");
vibra = (Vibrator) getApplicationContext().getSystemService(VIBRATOR_SERVICE);
vibra.vibrate(350);
unlock();
}
@SuppressWarnings("deprecation")
public void onDestroy()
{
winManager.removeView(this.layout);
layout.removeAllViews();
super.onDestroy();
//myThread.interrupt();
Log.i("Daze","Lockscreen Activity Destroyed");
}
/*
public void doWork(){
runOnUiThread(new Runnable(){
public void run(){
try{
//Fonts
Typeface OpenSans = Typeface.createFromAsset(getAssets(), "fonts/OpenSans/OpenSans-Light.ttf"); // size: 27dp
Typeface Alcubierre = Typeface.createFromAsset(getAssets(), "fonts/Alcubierre.otf"); // numeral size: 40dp
SP = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
btextClockEnabled = SP.getBoolean("textClockEnable",false);
cal = Calendar.getInstance();
String digitalClock = DigitalClock.createTimeString(cal.get(cal.MINUTE), cal.get(cal.HOUR));
String textClock = TimeMap.createTimeString(cal.get(cal.MINUTE),cal.get(cal.HOUR_OF_DAY));
if(btextClockEnabled == true){
button.setTypeface(OpenSans);
button.setText(textClock);
}
else{
button.setTextSize(40);
button.setTypeface(Alcubierre);
button.setText(digitalClock);
}
}
catch(Exception ex){}
}
});
}
private class CountDownRunner implements Runnable{
@Override
public void run(){
while(!Thread.currentThread().isInterrupted()){
try {
doWork();
Thread.sleep(1000);
}
catch(InterruptedException e){
Thread.currentThread().interrupt();
}
catch(Exception e){
}
}
}
}
*/
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.lockscreen, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
class TeleListener extends PhoneStateListener {
public void onCallStateChanged(int state, String incomingNumber) {
super.onCallStateChanged(state, incomingNumber);
switch (state) {
case TelephonyManager.CALL_STATE_RINGING:
unlock();
break;
default:
break;
}
}
}
}
LockscreenReceiver.java
package com.bikimax.lockscreen;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.view.WindowManager;
public class LockscreenReceiver extends BroadcastReceiver {
public LockscreenReceiver() {
}
@Override
public void onReceive(Context context, Intent intent0) {
// TODO: This method is called when the BroadcastReceiver is receiving
// an Intent broadcast.
Intent intent = new Intent(context,LockscreenActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.addFlags(WindowManager.LayoutParams.TYPE_SYSTEM_ERROR);
context.startActivity(intent);
Log.i("Daze", "Lockscreen activated");
}
}