在摄像头打开时在SurfaceView上绘图

我有以下用于访问摄像头预览的代码我想在预览图片的上角显示一些文本我该怎么做？在摄像头打开时在SurfaceView上绘图

package com.gps.ro.capturetest; 

import java.io.IOException; 

import android.app.Activity; 
import android.content.pm.ActivityInfo; 
import android.content.pm.PackageManager; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Paint; 
import android.graphics.PixelFormat; 
import android.hardware.Camera; 
import android.hardware.Camera.CameraInfo; 
import android.hardware.Camera.PictureCallback; 
import android.hardware.Camera.ShutterCallback; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.SurfaceHolder; 
import android.view.SurfaceView; 
import android.view.View; 
import android.view.Window; 
import android.view.WindowManager; 

public class CaptureTestActivity extends Activity implements SurfaceHolder.Callback { 
     SurfaceHolder mSurfaceHolder; 
     SurfaceView mSurfaceView; 
     public Camera mCamera; 
     boolean mPreviewRunning; 
     Canvas test; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     getWindow().setFormat(PixelFormat.TRANSLUCENT); 
     requestWindowFeature(Window.FEATURE_NO_TITLE); 
     getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
       WindowManager.LayoutParams.FLAG_FULLSCREEN); 
     setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); 
     setContentView(R.layout.main); 
     mSurfaceView = (SurfaceView) findViewById(R.id.camera_surface); 
     mSurfaceHolder = mSurfaceView.getHolder(); 
     mSurfaceHolder.addCallback(this); 
     mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); 




    } 

    public void surfaceChanged(SurfaceHolder arg0, int arg1, int h, int w) { 
     // TODO Auto-generated method stub 
     if (mPreviewRunning) { 
          mCamera.stopPreview(); 
         } 
         Camera.Parameters p = mCamera.getParameters(); 
         mCamera.setDisplayOrientation(90); 
         p.setPreviewSize(h, w); 
         p.set("orientation", "portrait"); 

         //p.setPreviewSize(w, h); 
         mCamera.setParameters(p); 
         try { 
          mCamera.setPreviewDisplay(arg0); 

         } catch (IOException e) { 
          e.printStackTrace(); 
         } 
         mCamera.startPreview(); 
         mPreviewRunning = true; 

    } 

    public void surfaceCreated(SurfaceHolder arg0) { 
     // TODO Auto-generated method stub 
     mCamera = Camera.open(); 
    } 

    public void surfaceDestroyed(SurfaceHolder arg0) { 
     // TODO Auto-generated method stub 
       mCamera.stopPreview(); 
       mPreviewRunning = false; 
       mCamera.release(); 
    } 

    public void Trigger(View V) 
    { 
     ShutterCallback shutterCallback = new ShutterCallback() { 
      public void onShutter() { 
       Log.d("DHA", "onShutter'd"); 
      } 
     }; 

     PictureCallback rawCallback = new PictureCallback() { 
      public void onPictureTaken(byte[] data, Camera camera) { 
       Log.d("DHA", "onPictureTaken - raw"); 
      } 


     }; 
     Log.w("DHA", "Intra aici!"); 
     mCamera.takePicture(shutterCallback, rawCallback, null); 

    } 







}

来源

2012-04-24 opc0de

创建另一个位于表面视图顶部的视图，并在该视图中绘制装饰。例如，您可以使用FrameLayout，并在其中使用SurfaceView，然后在预览顶部显示您想要的视图。

来源

2012-04-24 15:23:46 yoah

在摄像头打开时在SurfaceView上绘图

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