Question

您好我想在我的Android手机上并排显示实时相机预览。像这样：

https://lh6.googleusercontent.com/-Ngo4tD4AvWY/U8JOHxxQ9KI/AAAAAAAACK8/NZjnw1Yqg8A/w384-h287/2.jpg

只要左半屏显示实时预览或右侧显示，但如果我想同时显示左侧和右侧，我只是得到一个黑屏我不知道为什么。

清单

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="de.test.normaltest.sbscameraview" >

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

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:screenOrientation="landscape">

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

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

MainActivity

public class MainActivity extends Activity {
    private CameraView cameraView1;
    private CameraView cameraView2;
    private Camera mCamera1;
    private Camera mCamera2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mCamera1 = getCameraInstance();
        cameraView1 = new CameraView(this, mCamera1);
        cameraView2 = new CameraView(this, mCamera1);

        FrameLayout preview1 = (FrameLayout) findViewById(R.id.camera_preview1);
        preview1.addView(cameraView1);

        FrameLayout preview2 = (FrameLayout) findViewById(R.id.camera_preview2);
        preview2.addView(cameraView2);
    }

    /** A safe way to get an instance of the Camera object. */
    public static Camera getCameraInstance(){
        Camera c = null;
        try {
            c = Camera.open(); // attempt to get a Camera instance
        }
        catch (Exception e){
            Log.i("camera", "null");
        }
        return c; // returns null if camera is unavailable
    }
}

CameraView

public class CameraView extends SurfaceView implements SurfaceHolder.Callback {
    private SurfaceHolder mHolder;
    private Camera mCamera;


    public CameraView(Context context, Camera camera) {
        super(context);

        mHolder = getHolder();
        mHolder.addCallback(this);

        mCamera = camera;
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        try {
            mCamera.setPreviewDisplay(holder);
            mCamera.startPreview();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        Log.i("CameraView", "surfaceChanged");
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {

    }
}

[android并排相机

0 个答案: