Question

我想编写一个用于捕捉图片的Android相机程序。当我点击按钮时，我以这样的方式编写代码，它应该被捕获，但是注意到了。按钮单击发生，但控件不会出现在“onPictureTaken”上。我在这里粘贴我的代码：

活动

package com.andr.sai.camerademo;

import java.io.IOException;

import android.app.Activity;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.View.OnClickListener;
import android.widget.Button;

public class camerademo extends Activity implements SurfaceHolder.Callback 
 {
    /** Called when the activity is first created. */
 SurfaceView mSurfaceView ;
 SurfaceHolder    mSurfaceHolder;
 boolean mPreviewRunning;
 Camera  mCamera;
 Bitmap bitmap = null; 
 Button b1;

    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);
        setContentView(R.layout.camera_surface);
        b1=(Button)findViewById(R.id.b1);
        mSurfaceView = (SurfaceView) findViewById(R.id.surface_camera);
        mSurfaceHolder = mSurfaceView.getHolder();
        mSurfaceHolder.addCallback(this);
        mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

        b1.setOnClickListener(new OnClickListener()
        {

  @Override
   public void onClick(View arg0) {
   System.out.println("111111111111111111111111");
   Camera.PictureCallback mPictureCallback = new Camera.PictureCallback() 
   {


    public void onPictureTaken(byte[]imageData, Camera arg1) {
     System.out.println("2222222222222222222222222222222222222");
     BitmapFactory.Options opt = new BitmapFactory.Options(); 
                 bitmap = BitmapFactory.decodeByteArray(imageData, 0, imageData.length, opt); 


    }

   };


   }
        }
        );


    }

 @Override
 public void surfaceChanged(SurfaceHolder holder, int arg1, int w, int h) {
  if (mPreviewRunning) {
   mCamera.stopPreview();
   }
   Camera.Parameters p = mCamera.getParameters();
   p.setPreviewSize(w, h);
   mCamera.setParameters(p);
   try {
   mCamera.setPreviewDisplay(holder);
   } catch (IOException e) {
   e.printStackTrace();
   }
   mCamera.startPreview();
   mPreviewRunning = true;

 }

 @Override
 public void surfaceCreated(SurfaceHolder arg0) {
  mCamera = Camera.open(); 

 }

 @Override
 public void surfaceDestroyed(SurfaceHolder arg0) {
  mCamera.stopPreview();
  mPreviewRunning = false;
  mCamera.release();



 }




 public void onDraw(Canvas c)
  {

  c.drawColor(Color.WHITE);
  c.drawBitmap( bitmap, 10, 10, null);

 }

}

camera_surface.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<SurfaceView 
   android:id="@+id/surface_camera"
   android:layout_width="fill_parent" 
   android:layout_height="10dip"
   android:layout_weight="1"
> 
</SurfaceView> 

<Button
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="Gettt"
   android:id="@+id/b1"

></Button>

</LinearLayout>

在调试模式下，我运行了这个，我得到以下调试字符串：

08-24 17:43:41.293: ERROR/MediaPlayerService(30):   error: -2
08-24 17:43:41.303: ERROR/MediaPlayer(30): Unable to to create media player
08-24 17:43:41.303: ERROR/CameraService(30): Failed to load CameraService sounds.
08-24 17:43:41.334: ERROR/MediaPlayerService(30):   error: -2
08-24 17:43:41.344: ERROR/MediaPlayer(30): Unable to to create media player
08-24 17:43:41.344: ERROR/CameraService(30): Failed to load CameraService sounds.
08-24 17:43:41.354: DEBUG/CameraService(30): Client::Client X (pid 421)
08-24 17:43:41.364: DEBUG/CameraService(30): CameraService::connect X
08-24 17:43:41.364: DEBUG/CameraService(30): getParameters(picture-format=jpeg;picture-size=213x350;preview-format=yuv422sp;preview-frame-rate=15;preview-size=176x144)
08-24 17:43:41.445: DEBUG/CameraService(30): setParameters(preview-size=320x432;preview-format=yuv422sp;picture-size=213x350;picture-format=jpeg;preview-frame-rate=15)
08-24 17:43:41.445: DEBUG/CameraHardwareStub(30): initHeapLocked: preview size=320x432
08-24 17:43:41.455: DEBUG/CameraService(30): setPreviewDisplay(0xe1f0) (pid 421)
08-24 17:43:41.464: DEBUG/CameraService(30): startPreview (pid 421)
08-24 17:43:41.464: DEBUG/CameraService(30): startCameraMode(0) (pid 421)
08-24 17:43:41.464: DEBUG/CameraService(30): startPreviewMode (pid 421)

你可以帮我看看如何在Android中运行Sample camera程序来拍照。

Answer 1

我没有看到打电话 takePicture（Camera.ShutterCallback，Camera.PictureCallback，Camera.PictureCallback，Camera.PictureCallback）。

在onclick中添加Camera.takepicture

Answer 2

package makemachine.android.examples;
import java.io.File;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast; 

public class PhotoCaptureExample extends Activity 
 {
protected Button _button;
protected ImageView _image;
protected TextView _field;
protected String _path;
protected boolean _taken;

protected static final String PHOTO_TAKEN   = "photo_taken";

@Override
public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);

    setContentView(R.layout.main);

    _image = ( ImageView ) findViewById( R.id.image );
    _field = ( TextView ) findViewById( R.id.field );
    _button = ( Button ) findViewById( R.id.button );
    _button.setOnClickListener( new ButtonClickHandler() );

    _path = Environment.getExternalStorageDirectory() + "/images   /make_machine_example.jpg";
}

public class ButtonClickHandler implements View.OnClickListener 
{
    public void onClick( View view ){
        Log.i("MakeMachine", "ButtonClickHandler.onClick()" );
        startCameraActivity();
    }
}

protected void startCameraActivity()
{
    Log.i("MakeMachine", "startCameraActivity()" );
    File file = new File( _path );
    Uri outputFileUri = Uri.fromFile( file );

    Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE );
    intent.putExtra( MediaStore.EXTRA_OUTPUT, outputFileUri );

    startActivityForResult( intent, 0 );
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) 
{   
    Log.i( "MakeMachine", "resultCode: " + resultCode );
    switch( resultCode )
    {
        case 0:
            Log.i( "MakeMachine", "User cancelled" );
            break;

        case -1:
            onPhotoTaken();
            break;
    }
}

protected void onPhotoTaken()
{
    Log.i( "MakeMachine", "onPhotoTaken" );

    _taken = true;

    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inSampleSize = 4;

    Bitmap bitmap = BitmapFactory.decodeFile( _path, options );

    _image.setImageBitmap(bitmap);

    _field.setVisibility( View.GONE );
}

@Override 
protected void onRestoreInstanceState( Bundle savedInstanceState){
    Log.i( "MakeMachine", "onRestoreInstanceState()");
    if( savedInstanceState.getBoolean( PhotoCaptureExample.PHOTO_TAKEN ) ) {
        onPhotoTaken();
    }
}


@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
super.onKeyDown(keyCode, event);
    switch(keyCode)
    {
    case KeyEvent.KEYCODE_CAMERA:
     Toast.makeText(PhotoCaptureExample.this, "Pressed Camera Button", Toast.LENGTH_SHORT).show();
        return true;
    case KeyEvent.KEYCODE_1:
     Toast.makeText(PhotoCaptureExample.this, "Pressed 1", Toast.LENGTH_SHORT).show();
        return true;
    case KeyEvent.KEYCODE_HOME:
     Toast.makeText(PhotoCaptureExample.this, "Pressed Home Button", Toast.LENGTH_SHORT).show();
        return true;

    case KeyEvent.KEYCODE_BACK:
     Toast.makeText(PhotoCaptureExample.this, "Pressed Back Button", Toast.LENGTH_SHORT).show();
     Intent result = new Intent("Complete");
        setResult(Activity.RESULT_OK, result);
        finish();
        return true;
    }

    return false;
}


@Override
protected void onSaveInstanceState( Bundle outState ) {
    outState.putBoolean( PhotoCaptureExample.PHOTO_TAKEN, _taken );
}

}

如何在Android中运行Sample相机程序，拍照

活动

camera_surface.xml

2 个答案: