在调试时间敏感的程序时，实时在屏幕上打印当前系统时间非常有用，下面就是利用Andorid悬浮窗口制作的一个小工具，在屏幕上实时显示当前实际，此文件的基本版本来源于https://www.jianshu.com/p/ac63c57d2555，感谢@LightingContour的无私奉献：
直接贴代码，大家有疑问直接留言：
启动窗口，接受参数按不同的时间间隔显示时间：
package com.bely.debugassist;
import android.app.AppOpsManager;
import android.content.pm.PackageManager;
import android.content.Intent;
import android.os.Build;
import android.provider.Settings;
import android.app.Activity;
import android.os.Bundle;
import android.widget.Toast;
import android.os.UserHandle;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent startIntent = getIntent();
if (startIntent != null) {
int interval = startIntent.getIntExtra(Config.KEY_INTERVAL, Config.interval);
Config.interval = interval;
}
AppOpsManager appOps = this.getSystemService(AppOpsManager.class);
PackageManager mPackageManager = this.getPackageManager();
int uid = 0;
try{
uid = mPackageManager.getPackageUid("com.debugassist", UserHandle.USER_ALL);
}catch(PackageManager.NameNotFoundException e) {
}
appOps.setMode(AppOpsManager.OP_SYSTEM_ALERT_WINDOW,
uid, "com.debugassist", AppOpsManager.MODE_ALLOWED);
if (Settings.canDrawOverlays(MainActivity.this))
{
Intent intent = new Intent(MainActivity.this,MainService.class);
Toast.makeText(MainActivity.this,"DebugAssist enabled.",Toast.LENGTH_SHORT).show();
startService(intent);
finish();
}else
{
Toast.makeText(MainActivity.this,"Some error happens, cannot start.",Toast.LENGTH_SHORT).show();
finish();
}
}
}
Service 程序，负责显示时间
package com.bely.debugassist;
import java.text.SimpleDateFormat;
import java.util.Date;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.graphics.PixelFormat;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.SystemClock;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
public class MainService extends Service {
private static final String TAG = "MainService";
LinearLayout toucherLayout;
TextView txt_timer;
WindowManager.LayoutParams params;
WindowManager windowManager;
ImageButton imageButton1;
private static final int MSG_UPDATE_TIMER = 1001;
private long timeinms = 0;
int statusBarHeight = -1;
Handler msgHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
if (msg.what == MSG_UPDATE_TIMER) {
updateTime();
sendEmptyMessageDelayed(MSG_UPDATE_TIMER, Config.interval);
}
}
};
private void updateTime() {
Date now = new Date();
SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss:SSSZ");
String time = dateFormat.format(now);
if (txt_timer != null) {
txt_timer.setText(time);
}
}
@Override
public IBinder onBind(Intent intent)
{
return null;
}
@Override
public void onCreate()
{
super.onCreate();
Log.i(TAG,"MainService Created");
createToucher();
msgHandler.sendEmptyMessageDelayed(MSG_UPDATE_TIMER, Config.interval);
}
private void createToucher()
{
params = new WindowManager.LayoutParams();
windowManager = (WindowManager) getApplication().getSystemService(Context.WINDOW_SERVICE);
params.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;
params.format = PixelFormat.RGBA_8888;
params.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
params.gravity = Gravity.LEFT | Gravity.TOP;
params.x = 900;
params.y = 630;
params.width = 320;
params.height = 70;
LayoutInflater inflater = LayoutInflater.from(getApplication());
toucherLayout = (LinearLayout) inflater.inflate(R.layout.activity_main,null);
windowManager.addView(toucherLayout,params);
toucherLayout.measure(View.MeasureSpec.UNSPECIFIED,View.MeasureSpec.UNSPECIFIED);
int resourceId = getResources().getIdentifier("status_bar_height","dimen","android");
if (resourceId > 0)
{
statusBarHeight = getResources().getDimensionPixelSize(resourceId);
}
txt_timer = (TextView) toucherLayout.findViewById(R.id.txt_timer);
imageButton1 = (ImageButton) toucherLayout.findViewById(R.id.imageButton1);
imageButton1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (SystemClock.uptimeMillis() - timeinms >= 1500)
{
Toast.makeText(MainService.this,"click again to close",Toast.LENGTH_SHORT).show();
}else
{
stopSelf();
}
timeinms = SystemClock.uptimeMillis();
}
});
imageButton1.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
params.x = (int) event.getRawX();
params.y = (int) event.getRawY();
windowManager.updateViewLayout(toucherLayout,params);
return false;
}
});
}
@Override
public void onDestroy()
{
if (imageButton1 != null)
{
windowManager.removeView(toucherLayout);
}
super.onDestroy();
}
}
附 github链接 https://github.com/belyxiong/DebugAssist2