Android CameraControls / Camera Zoom / SurfaceView 问题 - 原因是什么？

Question

我仍然在实现一些 camera1 功能的路上，现在我遇到了一个 ZOOM 相关的问题，就是这样，尽管我在布局中包含了 zoomControls，并创建了一个 clickClisteners，不管怎样在运行程序之后，zoomControl 按钮根本没有响应。我在 SO 上尝试了相关主题中显示的所有方法，但是 none 对我不起作用。

因为这是我的第一个项目，请您更正我的代码，老实说Android文档很一般

在上面附上我的代码，非常感谢您的指导

package com.example.arturs.camerahowitworks;

import android.app.Activity;
import android.hardware.Camera;
import android.os.Bundle;
import android.util.Log;
import android.widget.FrameLayout;
import android.widget.ZoomControls;

public class MainActivity extends Activity
{

private Camera mcamera;
private CameraPreview Preview;
private static final String TAG = " => Main Activity: ";
private ZoomControls zoomControls;
//private FrameLayout pCameraLayout = null;


@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);  
    //enableZoom();
    FrameLayout preview = (FrameLayout)     findViewById(R.id.camera_preview); 

    mcamera = openFrontCamera(); 

    Preview = new CameraPreview(this, mcamera); 
    preview.addView(Preview);

    //ZoomControls zoomControls = (ZoomControls)  
    findViewById(R.id.zoomControls);

}

@Override 
protected void onResume()
{
super.onResume();
    Log.d(TAG, " -> onResume");
    try
    {

    }
    catch (Exception e)
    {
        e.printStackTrace();
        // finish();
    }
    Log.d(TAG, " -> onResume");
}

@Override
protected void onPause()
{
    Log.d(TAG, " -> onPause");
    mcamera.release();
    mcamera = null;
    super.onPause();
    Log.d(TAG, " <- onPause");

}

@Override
protected void onStop()
{
    Log.d(TAG, " -> onStop");
    finish();
    super.onStop();
    Log.d(TAG, " <- onStop");
}

public Camera openFrontCamera()
{
    int cameraCount = 0; 
    Camera cam; 
    Camera.CameraInfo cameraInfo = new Camera.CameraInfo(); 
    cameraCount = Camera.getNumberOfCameras(); 
    for (int camID = 0; camID < cameraCount; camID++)  
    {
        Camera.getCameraInfo(camID, cameraInfo);
        Log.d(TAG, "CameraInfo" + cameraInfo.facing );
        if(cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) 
        {
            try
            {
                //return cam = Camera.open(camID); 
                return Camera.open(camID);
            }
            catch (RuntimeException e)
            {
                Log.e(TAG, "Camera failed to open" + e.getLocalizedMessage());
            }
        }

    }

    return null;
}


}

相机预览class

           package com.example.arturs.camerahowitworks;

 import android.content.Context;
 import android.hardware.Camera;
 import android.util.Log;
 import android.view.Display;
 import android.view.Surface;
 import android.view.SurfaceHolder;
 import android.view.SurfaceView;
 import android.view.View;
 import android.view.WindowManager;
 import android.widget.ZoomControls;
 import java.io.IOException;
 import java.util.List;

 public class CameraPreview extends SurfaceView implements  
 SurfaceHolder.Callback
 {
private static final String TAG = " => Main Activity: ";
private SurfaceHolder holder;
private Camera mcamera;
private Context mContext;
int currentZoomLevel = 0;
int maxZoomLevel = 0;
ZoomControls zoomControls;



public CameraPreview(Context context, Camera camera)
{
    super(context); 
    mContext = context;
    this.mcamera = camera;
    holder = getHolder();
    holder.addCallback(this); 
    holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

}


@Override
public void surfaceCreated(SurfaceHolder holder)
{
    if(mcamera == null) return; 
    try
    {
        mcamera.setDisplayOrientation(90); 
        mcamera.setPreviewDisplay(holder); 
        mcamera.startPreview(); 
    }
    catch (IOException e)
    {
        Log.d(TAG, "Blad wlaczania podgladu kamery: " + e.getMessage());
    }

}

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


    if(holder.getSurface() == null) 
    {
        return;
    }
    try
    {
        mcamera.stopPreview();
    }
    catch (Exception e)
    {

    }
    Camera.Parameters params = mcamera.getParameters(); 
    List<Camera.Size> sizes = params.getSupportedPreviewSizes(); 
    Camera.Size optionalSize = getBestPreviewSize(width, height); 
    params.setPreviewSize(optionalSize.width, optionalSize.height); 

    mcamera.setParameters(params); 

    Display display = ((WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
    switch (display.getRotation())
    {
        case Surface.ROTATION_0: mcamera.setDisplayOrientation(90); break;
        case Surface.ROTATION_90: mcamera.setDisplayOrientation(0); break;
        case Surface.ROTATION_180: mcamera.setDisplayOrientation(270); break;
        case Surface.ROTATION_270: mcamera.setDisplayOrientation(180); break;
    }

    try
    {
        mcamera.setParameters(params); 
        mcamera.setPreviewDisplay(holder);
        mcamera.startPreview();


    }
    catch (IOException e)
    {
        Log.d(TAG, "Blad wlaczania podgladu kamery" + e.getStackTrace());
    }


    ZoomControls zoomControls = (ZoomControls) findViewById(R.id.zoomControls);

    if (params.isZoomSupported()) {
        maxZoomLevel = params.getMaxZoom();

        try {

            zoomControls.setIsZoomInEnabled(true);
            zoomControls.setIsZoomOutEnabled(true);

            zoomControls.setOnZoomInClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                    if (currentZoomLevel < 500) {
                        currentZoomLevel++;
                        mcamera.startSmoothZoom(currentZoomLevel);
                    }
                }
            });

            zoomControls.setOnZoomOutClickListener(new OnClickListener() {
                public void onClick(View v) {
                    if (currentZoomLevel > 0) {
                        currentZoomLevel--;
                        mcamera.startSmoothZoom(currentZoomLevel);
                    }
                }
            });
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }



    }
    else {
        zoomControls.hide();
    }


@Override
public void surfaceDestroyed(SurfaceHolder holder)
{
    mcamera.release(); 
    mcamera = null; 
}

private Camera.Size getBestPreviewSize(int width, int height) {
    Camera.Size result = null;
    Camera.Parameters p = mcamera.getParameters(); 
    for (Camera.Size size : p.getSupportedPreviewSizes()) { 
        if (size.width <= width && size.height <= height) {
            if (result == null) {
                result = size;
            } else {
                int resultArea = result.width * result.height;
                int newArea = size.width * size.height;

                if (newArea > resultArea) {
                    result = size;
                }
            }
        }
    }
    return result;
 }

 }

main_activity.xml

 <RelativeLayout  
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal">

<FrameLayout
    android:id="@+id/camera_preview"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_weight="1" >


</FrameLayout>

<ZoomControls
    android:id="@+id/zoomControls"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_alignParentRight="true"/>
</RelativeLayout>

android 清单

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

<uses-feature android:name="android.hardware.Camera"/>
<uses-permission android:name="android.permission.CAMERA"/>

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity"
        android:configChanges="orientation|screenSize">

        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

已添加日志

 $ adb shell am start -n 
"com.example.arturs.camerahowitworksv2/com.example.arturs.camerahowitwork 
sv2.MainActivity" -a android.intent.action.MAIN -c 
android.intent.category.LAUNCHER -D
Waiting for application to come online:  
com.example.arturs.camerahowitworksv2 |    
com.example.arturs.camerahowitworksv2.test
Waiting for application to come online: 
com.example.arturs.camerahowitworksv2 | 
com.example.arturs.camerahowitworksv2.test
Connecting to com.example.arturs.camerahowitworksv2
E/Trace: error opening trace file: No such file or directory (2)
D/ActivityThread: setTargetHeapUtilization:0.25
D/ActivityThread: setTargetHeapIdealFree:8388608
D/ActivityThread: setTargetHeapConcurrentStart:2097152
W/ActivityThread: Application com.example.arturs.camerahowitworksv2    
is waiting for the debugger on port 8100...
I/System.out: Sending WAIT chunk
I/dalvikvm: Debugger is active
Connected to the target VM, address: 'localhost:8609', transport:    
'socket'
I/System.out: Debugger has connected
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: debugger has settled (1456)
D/ => Main Activity:: CameraInfo0
D/ => Main Activity::  -> onResume
D/ => Main Activity::  -> onResume
D/libEGL: loaded /system/lib/egl/libEGL_adreno200.so
D/libEGL: loaded /system/lib/egl/libGLESv1_CM_adreno200.so
D/libEGL: loaded /system/lib/egl/libGLESv2_adreno200.so
I/Adreno200-EGL: <qeglDrvAPI_eglInitialize:299>: EGL 1.4 QUALCOMM   
build:  (Merge)
             Build Date: 07/09/13 Tue
             Local Branch: AU_41
             Remote Branch: 
             Local Patches: 
             Reconstruct Branch: 
D/OpenGLRenderer: Enabling debug mode 0
W/System.err: java.lang.NullPointerException
W/System.err:     at     


com.example.arturs.camerahowitworksv2.CameraPreview.surfaceChanged
(Camera . Preview.java:131)
W/System.err:     at   
android.view.SurfaceView.updateWindow(SurfaceView.java:558)
W/System.err:     at   
android.view.SurfaceView.access[=15=]0(SurfaceView.java:85)
W/System.err:     at   
android.view.SurfaceView.onPreDraw(SurfaceView.java:173)
W/System.err:     at   
 android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:671)
W/System.err:     at   
android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1828)
W/System.err:     at   
android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1004)
W/System.err:     at   
android.view.ViewRootImpl$TraversalRunnable.run
(ViewRootImpl.java:4223)
W/System.err:     at android.view.Choreographer$CallbackRecord.run
(Choreographer.java:725)
W/System.err:     at android.view.Choreographer.doCallbacks
(Choreographer.java:555)
W/System.err:     at   
android.view.Choreographer.doFrame(Choreographer.java:525)
W/System.err:     at 
android.view.Choreographer$FrameDisplayEventReceiver.run
 (Choreographer.java:711)
 W/System.err:     at  
 android.os.Handler.handleCallback(Handler.java:615)
 W/System.err:     at   
 android.os.Handler.dispatchMessage(Handler.java:92)
 W/System.err:     at android.os.Looper.loop(Looper.java:213)
 W/System.err:     at    
 android.app.ActivityThread.main(ActivityThread.java:4787)
 W/System.err:     at java.lang.reflect.Method.invokeNative(Native   
 Method)
 W/System.err:     at   
 java.lang.reflect.Method.invoke(Method.java:511)
 W/System.err:     at   
 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run
(ZygoteInit.java:789)
W/System.err:     at com.android.internal.os.ZygoteInit.main
(ZygoteInit.java:556)
W/System.err:     at dalvik.system.NativeStart.main
(Native Method)
I/Choreographer: Skipped 108 frames!  The application may be doing   
too much work on its main thread.
W/Adreno200-ES20: <qgl2DrvAPI_glBufferSubData:778>: GL_INVALID_VALUE
D/OpenGLRenderer: GL error from OpenGLRenderer: 0x501
E/OpenGLRenderer:   GL_INVALID_VALUE

Answer 1

来自文档：

https://developer.android.com/reference/android/widget/ZoomControls.html

The ZoomControls class displays a simple set of controls used for zooming and provides callbacks to register for events.

您需要为缩放控件设置点击监听器。添加它只是添加 UI 而不是功能。

例如：https://developer.android.com/reference/android/widget/ZoomControls.html#setOnZoomInClickListener(android.view.View.OnClickListener)

((ZoomControls) findViewById(R.id.zoomControls)).setOnZoomInClickListener( new View.OnClickListener() {

   @Override
   public void onClick(View button) {
       // TODO zoom in
   }

});

__

目前你只有这个

//ZoomControls zoomControls = (ZoomControls)  
findViewById(R.id.zoomControls);

什么都不做

Android CameraControls / Camera Zoom / SurfaceView 问题 - 原因是什么？

Android CameraControls / Camera Zoom / SurfaceView issues - what's the reason?

android

surfaceview

android-hardware