SurfaceViewer.java

package cn.mutils.app.ui;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.DrawFilter;
import android.graphics.Paint;
import android.graphics.PaintFlagsDrawFilter;
import android.graphics.PixelFormat;
import android.graphics.PorterDuff.Mode;
import android.util.AttributeSet;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

/**
 * SurfaceViewer of framework<br>
 * High performance requirements for UI.
 */
@SuppressLint("WrongCall")
public class SurfaceViewer extends SurfaceView implements SurfaceHolder.Callback, Runnable {

    protected SurfaceHolder mSurfaceHolder;
    protected Thread mDrawThread;

    public SurfaceViewer(Context context) {
        super(context);
        init(context, null);
    }

    public SurfaceViewer(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context, attrs);
    }

    public SurfaceViewer(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(context, attrs);
    }

    protected void init(Context context, AttributeSet attrs) {
        this.setZOrderOnTop(true);
        mSurfaceHolder = getHolder();
        mSurfaceHolder.setFormat(PixelFormat.TRANSLUCENT);
        mSurfaceHolder.addCallback(this);
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        synchronized (this) {
            if (mDrawThread != null) {
                mDrawThread.interrupt();
            }
            mDrawThread = new Thread(this);
            mDrawThread.start();
        }
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        synchronized (this) {
            if (mDrawThread != null) {
                mDrawThread.interrupt();
                mDrawThread = null;
            }
        }
    }

    public long getDrawThreadId() {
        synchronized (this) {
            return mDrawThread != null ? mDrawThread.getId() : 0;
        }
    }

    @Override
    public void run() {
        while (Thread.currentThread().getId() == getDrawThreadId()) {
            Canvas c = null;
            int saveCount = 0;
            try {
                c = mSurfaceHolder.lockCanvas();
                if (c != null) {
                    saveCount = c.save();
                    DrawFilter filter = new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);
                    c.setDrawFilter(filter);
                    c.drawColor(Color.TRANSPARENT, Mode.CLEAR);
                    onDraw(c, c.getWidth(), c.getHeight());
                }
                Thread.sleep(16);// 60fps
            } catch (Exception e) {
                if (e != null && (e instanceof InterruptedException)) {
                    return;
                }
            } finally {
                if (c != null) {
                    try {
                        if (saveCount != 0) {
                            c.restoreToCount(saveCount);
                        }
                        mSurfaceHolder.unlockCanvasAndPost(c);
                    } catch (Exception e) {
                        // java.lang.IllegalStateException
                    }
                }
            }
        }
    }

    /**
     * High performance draw logic of viewer<br>
     * This is called by owned draw thread.
     */
    protected void onDraw(Canvas canvas, int width, int height) {

    }

}