承载SurfaceView的片段仅绘制到Canvas一次

问题描述 投票：0回答：1

晚安，我把我的大项目最小化到一个小规模的项目，它仍然保留了我所拥有的问题的所有方面。我正在使用一个在单个Button下面绘制SurfaceView背景的活动。按下按钮，Button会添加一个新片段（到MainActivities XML布局中的空FrameLayout），它还包含SurfaceView和ConstraintLayout中的三个按钮。按钮按预期工作并调用片段，但只绘制静态布局部分（三个按钮），就像SurfaceView一样，它只绘制初始画布并保持重绘相同的帧，甚至线程继续使用更新的值调用Draw方法（在这种情况颜色）。 ThreadPool用于创建两个实例，用于调用SurfaceView（MaintActivity和Fragment）类对象的更新和绘制方法（此部分按预期工作）。我也在Log中获得这一行，关于问题的起点。

    D/MY FRAGMENT VIEW: >> INIT 
D/MY FRAGMENT VIEW: SURFACE CREATED
D/MY_FRAGMENT: SURFACE CREATED
D/MY FRAGMENT VIEW: SURFACE CHANGED
D/MY_FRAGMENT: SURFACE CHANGED
D/MY FRAGMENT VIEW: DRAW PLANET
D/: HostConnection::get() New Host Connection established 0xb2d1d780, tid 9982
D/MY FRAGMENT VIEW: DRAW PLANET
D/MY FRAGMENT VIEW: DRAW PLANET
D/MY FRAGMENT VIEW: DRAW PLANET
D/MY FRAGMENT VIEW: DRAW PLANET

代码示例如下：

    package com.badcompany.testfragmentview;

import android.os.Bundle;
import android.support.constraint.ConstraintLayout;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;

public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback {
    private MyActivityView gameView;
    private static final String TAG = "MAIN";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);

        gameView = findViewById(R.id.myview);
        SurfaceHolder gholder = gameView.getHolder();
        gholder.addCallback(this);
        gameView.setLayoutParams(new ConstraintLayout.LayoutParams(ConstraintLayout.LayoutParams.WRAP_CONTENT, ConstraintLayout.LayoutParams.WRAP_CONTENT));

        Button btn_map = findViewById(R.id.start);
        btn_map.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {
                    case MotionEvent.ACTION_UP:
                        displayMapFragment();
                        return true;
                }
                return false;
            }
        });
    }

    @Override
    public void surfaceCreated(SurfaceHolder surfaceHolder) {
        Log.d(TAG, ">> SURFACE CREATED");
    }

    @Override
    public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {
        Log.d(TAG, ">> SURFACE CHANGED");
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
        Log.d(TAG, ">> SURFACE DESTROYED");

    }

    private void displayMapFragment() {
        MyFragment myFragment = new MyFragment();
        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.add(R.id.myMapSpace, myFragment).addToBackStack(null)
                .commit();
        /*fragmentTransaction.add(R.id.fragment_container, simpleFragment).addToBackStack(null).commit();
        mButton.setText(R.string.close);
        isFragmentDisplayed = true;*/
    }
}

activity_main.xml中

    <?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <com.badcompany.testfragmentview.MyActivityView
        android:id="@+id/myview"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <Button
        android:id="@+id/start"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <FrameLayout
        android:id="@+id/myMapSpace"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>

my activity view.Java

    package com.badcompany.testfragmentview;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.Log;
import android.view.SurfaceHolder;

public class MyActivityView extends ParentGameView implements SurfaceHolder.Callback {
    private static final String TAG = "MY ACTIVITY VIEW";
    public MyActivityView(Context context) {
        super(context);
    }

    public MyActivityView(Context context, AttributeSet attrs) {
        super(context, attrs);
        getHolder().addCallback(this);
        setFocusable(true);
    }

    public MyActivityView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    public MyActivityView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    @Override
    public void surfaceCreated(SurfaceHolder surfaceHolder) {
        Log.d(TAG, "SURFACE CREATED");
        MyExecutor.getInstance().execute(new GameRunnable(surfaceHolder, this));
    }

    @Override
    public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {
        Log.d(TAG, "SURFACE CHANGED");
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
        Log.d(TAG, "SURFACE DESTROYED");
    }

    @Override
    public void draw(Canvas canvas) {
        super.draw(canvas);
        canvas.drawColor(Color.YELLOW);
        Paint paint = new Paint();
        paint.setColor(Color.RED);
        canvas.drawCircle(x, 100, 200, paint);
    }
}

my fragment.Java

package com.badcompany.testfragmentview;

import android.os.Bundle;
import android.support.constraint.ConstraintLayout;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.SurfaceHolder;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;

public class MyFragment extends Fragment implements SurfaceHolder.Callback {
    private static final String TAG = "MY_FRAGMENT";
    private  MyFragmentView myFragmentView;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup viewGroup, Bundle savedInstanceState) {
        //AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        final View rootView  = inflater.inflate(R.layout.fragment_my, viewGroup, false);
        myFragmentView = rootView.findViewById(R.id.myMapView);
        SurfaceHolder mSurfaceHolder = myFragmentView.getHolder();
        mSurfaceHolder.addCallback(this);
        myFragmentView.setLayoutParams(new ConstraintLayout.LayoutParams(ConstraintLayout.LayoutParams.WRAP_CONTENT, ConstraintLayout.LayoutParams.WRAP_CONTENT));

        Button selectGalaxyMap = rootView.findViewById(R.id.btn_select_galaxy_map);
        Button selectSolarSystemMap = rootView.findViewById(R.id.btn_select_solar_map);
        Button selectPlanetMap = rootView.findViewById(R.id.btn_select_planet_map);

        selectGalaxyMap.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Log.d(TAG, "SELECTED GALAXY");
                myFragmentView.setColor(1);
                Toast.makeText(getActivity(), "SELECT GALAXY", Toast.LENGTH_SHORT).show();
            }
        });
        selectSolarSystemMap.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                myFragmentView.setColor(2);
                Log.d(TAG, "SELECTED SYSTEM");
                Toast.makeText(getActivity(), "SELECT SYSTEM", Toast.LENGTH_SHORT).show();
            }
        });
        selectPlanetMap.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(getActivity(), "SELECT PLANET", Toast.LENGTH_SHORT).show();
                myFragmentView.setColor(3);
                Log.d(TAG, "SELECTED PLANET");
            }
        });

        return rootView;
    }
    @Override
    public void surfaceCreated(SurfaceHolder surfaceHolder) {
        Log.d(TAG, "SURFACE CREATED");
    }

    @Override
    public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {
        Log.d(TAG, "SURFACE CHANGED");
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
        Log.d(TAG, "SURFACE DESTROYED");
    }
}

fragment_my.xml

    <com.badcompany.testfragmentview.MyFragmentView
        android:id="@+id/myMapView"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:background="@color/colorPrimary"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

    <Button
        android:id="@+id/btn_select_planet_map"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:background="@null"
        android:text="SELECT PLANET"
        android:textStyle="bold" />

    <Button
        android:id="@+id/btn_select_solar_map"
        app:layout_constraintRight_toLeftOf="@id/btn_select_planet_map"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:background="@null"
        android:text="SELET SYSTEM"
        android:textStyle="bold" />

    <Button
        android:id="@+id/btn_select_galaxy_map"
        app:layout_constraintRight_toLeftOf="@id/btn_select_solar_map"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:background="@null"
        android:text="SELECT GALAXY"
        android:textStyle="bold" />
</android.support.constraint.ConstraintLayout>

package com.badcompany.testfragmentview;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.Log;
import android.view.SurfaceHolder;

public class MyFragmentView extends ParentGameView implements SurfaceHolder.Callback {
    private static final String TAG = "MY FRAGMENT VIEW";
    private int Colors;

    public MyFragmentView(Context context) {
        super(context);
        init(context);
    }

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

    public MyFragmentView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(context);
    }

    public MyFragmentView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
        init(context);
    }
    private void init(Context context) {
        getHolder().addCallback(this);
        Log.d(TAG, ">> INIT ");
        setFocusable(true);
    }
    @Override
    public void draw(Canvas canvas) {
        super.draw(canvas);
        if(Colors == 2)
            drawSolarMap(canvas);
        else if(Colors == 1)
            drawGalaxyMap(canvas);
        else drawPlanetMap(canvas);
    }

    private void drawGalaxyMap(Canvas canvas){
        Log.d(TAG, "DRAW GALAXY");
        canvas.drawColor(Color.BLACK);
        Paint paint = new Paint();
        paint.setColor(Color.BLUE);
        canvas.drawCircle(x, 100, 100, paint);
    }

    private void drawSolarMap(Canvas canvas){
        Log.d(TAG, "DRAW SYSTEM");
        canvas.drawColor(Color.RED);
        Paint paint = new Paint();
        paint.setColor(Color.BLUE);
        canvas.drawCircle(x, 100, 100, paint);
    }

    private void drawPlanetMap(Canvas canvas){
        Log.d(TAG, "DRAW PLANET");
        canvas.drawColor(Color.GREEN);
        Paint paint = new Paint();
        paint.setColor(Color.BLUE);
        canvas.drawCircle(x, 100, 100, paint);
    }

    @Override
    public void update() {
        super.update();
    }

    public void setColor(int color){
        Colors = color;
    }

    @Override
    public void surfaceCreated(SurfaceHolder surfaceHolder) {
        Log.d(TAG, "SURFACE CREATED");
        MyExecutor.getInstance().execute(new GameRunnable(surfaceHolder, this));
    }

    @Override
    public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {
        Log.d(TAG, "SURFACE CHANGED");
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
        Log.d(TAG, "SURFACE DESTROYED");
    }
}

可能与GameInterface.java无关的额外类

package com.badcompany.testfragmentview;

/**
 * Created by Donatas on 18/12/2018.
 */

import android.graphics.Canvas;
public interface GameInterface {
    public void draw(Canvas canvas);
    public void update();
}

parent game view.Java

package com.badcompany.testfragmentview;

import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.SurfaceView;

public class ParentGameView  extends SurfaceView implements GameInterface{
    private static final String TAG = "PARENT_GAME_VIEW";
    protected int x = 0;
    public ParentGameView(Context context) {
        super(context);
    }

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

    public ParentGameView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    public ParentGameView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }


    @Override
    public void update() {
        x++;
    }

    @Override
    public void draw(Canvas canvas){
        super.draw(canvas);

    }

}

my executor.Java

package com.badcompany.testfragmentview;

import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors;

public class MyExecutor {private static final ExecutorService executor = Executors.newCachedThreadPool（）;

public static ExecutorService getInstance(){
    return executor;
}

public static void ShutDown(){
    executor.shutdown();
}

}

game runnable.Java

package com.badcompany.testfragmentview;

import android.graphics.Canvas;
import android.util.Log;
import android.view.SurfaceHolder;

public class GameRunnable implements Runnable {
    private static final String TAG = "GAME_RUNNABLE";
    private  volatile boolean running = true;
    private  final int maxFPS = 30;
    private  double averageFPS;
    private Canvas canvas;
    private final SurfaceHolder surfaceHolder;
    private  volatile ParentGameView gameView;

    public GameRunnable(SurfaceHolder surfaceHolder, ParentGameView gameView) {
        this.surfaceHolder = surfaceHolder;
        this.gameView = gameView;
    }

    @Override
    public void run() {
        Thread.currentThread().setPriority(Thread.MAX_PRIORITY);

        long startTime;
        long timeMillis = 1000/maxFPS;
        long waitTime;
        int frameCount = 0;
        long totalTime = 0;
        long targetTime = 1000/maxFPS;
        while(running){
            startTime = System.nanoTime();
            canvas = null;
            try {
                canvas = surfaceHolder.lockCanvas();
                if(canvas != null){
                    synchronized (surfaceHolder){
                        gameView.update();
                        gameView.draw(canvas);
                    }
                } else {
                    Log.d(TAG, "Thread finished work");
                    return;
                }
            }
            catch (Exception e){
                e.printStackTrace();
            }
            finally {
                if(canvas != null){
                    try{
                        surfaceHolder.unlockCanvasAndPost(canvas);
                    }catch (Exception e){e.printStackTrace();}
                }
            }
            timeMillis = (System.nanoTime() - startTime)/1000000;
            waitTime = targetTime - timeMillis;
            try{
                if(waitTime>0)
                    Thread.sleep(waitTime);
            } catch (Exception e){e.printStackTrace();}
            totalTime += System.nanoTime() - startTime;
            frameCount++;
            if(frameCount == maxFPS){
                averageFPS = 1000/((totalTime/frameCount)/1000000);
                frameCount = 0;
                totalTime = 0;
                //debug System.out.println("AVERAGE FPS: " + avaragFPS);

            }

        }
    }
}

感谢您查看此内容，如果您需要其他信息，请发表评论。

java android android-fragments android-canvas surfaceview
1个回答
0
投票

我自己找到了一个糟糕的解决方案，问题是MainActivity不会要求下一帧，因为它认为片段视图已经完成，在Thread中调用invalidate()方法会使活动继续请求更新的视图。如果您设法找到更好的解决方案，请更新此帖子，谢谢。

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