Android视频播放器屏幕左侧边随手指上下滑动亮度调节变暗变亮原理实现

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Android视频播放器屏幕左侧边随手指上下滑动亮度调节变暗变亮原理实现

Java代码：

package zhangphil.app;import android.app.Activity;import android.os.Bundle;import android.view.LayoutInflater;import android.view.MotionEvent;import android.view.View;import android.view.WindowManager;import android.widget.TextView;public class MainActivity extends Activity {    private float startY = 0;//手指按下时的Y坐标    private float startX = 0;//手指按下时的Y坐标    private TextView brightnessTextView;    private View mVideoView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        mVideoView = LayoutInflater.from(this).inflate(R.layout.activity_main, null);        setContentView(mVideoView);        brightnessTextView = (TextView) mVideoView.findViewById(R.id.text);    }    /*    * 设置屏幕亮度    * 0 最暗    * 1 最亮    */    public void setBrightness(float brightness) {        WindowManager.LayoutParams lp = getWindow().getAttributes();        lp.screenBrightness = lp.screenBrightness + brightness / 255.0f;        if (lp.screenBrightness > 1) {            lp.screenBrightness = 1;        } else if (lp.screenBrightness < 0.1) {            lp.screenBrightness = (float) 0.1;        }        getWindow().setAttributes(lp);        float sb = lp.screenBrightness;        brightnessTextView.setText((int) Math.ceil(sb * 100) + "%");    }    @Override    public boolean onTouchEvent(MotionEvent event) {        int screenWidth = mVideoView.getWidth();        switch (event.getAction()) {            case MotionEvent.ACTION_DOWN:                startX = event.getX();                startY = event.getY();                break;            case MotionEvent.ACTION_MOVE:                float endY = event.getY();                float distanceY = startY - endY;                if (startX > screenWidth / 2) {                    //右边                    //在这里处理音量                } else {                    //屏幕左半部分上滑，亮度变大，下滑，亮度变小                    final double FLING_MIN_DISTANCE = 0.5;                    final double FLING_MIN_VELOCITY = 0.5;                    if (distanceY > FLING_MIN_DISTANCE && Math.abs(distanceY) > FLING_MIN_VELOCITY) {                        setBrightness(10);                    }                    if (distanceY < FLING_MIN_DISTANCE && Math.abs(distanceY) > FLING_MIN_VELOCITY) {                        setBrightness(-10);                    }                }                break;        }        return super.onTouchEvent(event);    }}

activity_main.xml布局文件：

<?xml version="1.0" encoding="utf-8"?><FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="@mipmap/ic_launcher">    <TextView        android:id="@+id/text"        android:layout_width="150dp"        android:layout_height="50dp"        android:layout_gravity="center"        android:background="@android:color/holo_orange_light"        android:gravity="center"        android:textColor="@android:color/white" /></FrameLayout>

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