其他 - Android屏幕上的浮动视图

我想制作一个浮动视图，用户可以在屏幕上拖动它。

想法是启动服务，然后在屏幕上放大视图。

但这是一个问题，它采取了所有用户输入事件，而不是采取事件属于它自己。

这是我的代码：manifest.xml：

    <?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.floatandroidpractice"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.floatandroidpractice.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <service android:name="com.example.floatandroidpractice.WalkingIconService" />
    </application>

</manifest>

可以拖动的浮动视图：

package com.example.floatandroidpractice;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.MotionEvent;
import android.view.View;

public class littleIconView extends View {
    private float viewX;
    private float viewY;
    private Paint mPaint;
    private Bitmap androidIcon;

    public littleIconView(Context context) {
        super(context);
        mPaint = new Paint();
        mPaint.setColor(Color.BLACK);
        androidIcon = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);

    }

    @Override
    public void onDraw(Canvas cvs) {
        cvs.drawBitmap(androidIcon, viewX - androidIcon.getWidth() / 2, viewY - androidIcon.getHeight()
                / 2, mPaint);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        boolean touchedX = Math.abs(viewX - event.getX()) > androidIcon.getWidth();
        boolean touchedY = Math.abs(viewY - event.getY()) > androidIcon.getHeight();
        boolean isValidTouch = !touchedX && !touchedY;
        if (isValidTouch) {
            if (event.getAction() == MotionEvent.ACTION_DOWN || event.getAction() == MotionEvent.ACTION_MOVE
                    || event.getAction() == MotionEvent.ACTION_UP) {
                viewX = event.getX();
                viewY = event.getY();
            }
            invalidate();
            return true;

        }
        else
            return false;
    }
}

和服务：

package com.example.floatandroidpractice;
import android.app.Service;
import android.content.Intent;
import android.graphics.PixelFormat;
import android.os.IBinder;
import android.view.WindowManager;
import android.view.WindowManager.LayoutParams;

public class WalkingIconService extends Service {

    @Override
    public void onCreate() {
        super.onCreate();

    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        littleIconView a = new littleIconView(getApplicationContext());
        LayoutParams mLayoutParams = new WindowManager.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 0, 0, PixelFormat.TRANSPARENT);
        WindowManager mWindowManager = (WindowManager) this.getSystemService(WINDOW_SERVICE);
        mLayoutParams.flags = LayoutParams.FLAG_NOT_TOUCH_MODAL | LayoutParams.FLAG_NOT_FOCUSABLE
                | LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH |
                LayoutParams.FLAG_LAYOUT_INSET_DECOR | LayoutParams.FLAG_LAYOUT_IN_SCREEN;
        mWindowManager.addView(a, mLayoutParams);
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

}

完整的项目：https : //github.com/shanwu/shanwu_coding_base/tree/xxx/floatAndroidPractice