Android对焦拍照功能实现

package cn.sun.picture; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import android.app.Activity; import android.content.Context; import android.content.res.Configuration; import android.graphics.Bitmap; import android.graphics.Bitmap.CompressFormat; import android.graphics.BitmapFactory; import android.graphics.PixelFormat; import android.hardware.Camera; import android.hardware.Camera.AutoFocusCallback; import android.hardware.Camera.PictureCallback; import android.hardware.Camera.ShutterCallback; import android.os.Bundle; import android.os.Environment; import android.util.Log; import android.view.Display; import android.view.Menu; import android.view.MenuItem; import android.view.MotionEvent; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.Window; import android.view.WindowManager; import android.widget.Toast; public class MainActivity extends Activity { private static final String TAG = "MainActivity"; private SurfaceView surfaceView; private Camera camera; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Window window = getWindow(); requestWindowFeature(Window.FEATURE_NO_TITLE); window.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); setContentView(R.layout.main); surfaceView = (SurfaceView) findViewById(R.id.surfaceView); surfaceView.getHolder().setFixedSize(176, 144); // 设置SurfaceHolder对象的类型 surfaceView.getHolder() .setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); // 指定用于捕捉拍照事件的SurfaceHolder.Callback对象 surfaceView.getHolder().addCallback(new SurfaceCallback()); } private final class SurfaceCallback implements SurfaceHolder.Callback { private boolean preview; @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } @Override public void surfaceCreated(SurfaceHolder holder) { // 获得Camera对象 camera = Camera.open(); WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE); Display display = wm.getDefaultDisplay(); Camera.Parameters parameters = camera.getParameters(); // 根据屏幕方向设置预览尺寸 parameters.setPreviewSize(display.getWidth(), display.getHeight()); parameters.setPreviewFrameRate(3); // 设置照片格式 parameters.setPictureFormat(PixelFormat.JPEG); parameters.set("jpeg-quality", 85); // 设置拍摄照片的实际分辨率，本例中的分辨率是1024×768 parameters.setPictureSize(display.getWidth(), display.getHeight()); if (MainActivity.this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) { // 如果是竖屏 parameters.set("orientation", "portrait"); // 在2.2以上可以使用 // camera.setDisplayOrientation(90); } else { parameters.set("orientation", "landscape"); // 在2.2以上可以使用 // camera.setDisplayOrientation(0); } // 设置保存的图像大小 camera.setParameters(parameters); try { // 设置用于显示拍照影像的SurfaceHolder对象 camera.setPreviewDisplay(surfaceView.getHolder()); camera.startPreview(); preview = true; } catch (IOException e) { Log.e(TAG, e.toString()); } } @Override public void surfaceDestroyed(SurfaceHolder holder) { if (camera != null) { if (preview) { camera.stopPreview(); } // 释放手机摄像头 camera.release(); } } } private final class TakePictureCallback implements PictureCallback { // 该方法用于处理拍摄后的照片数据 @Override public void onPictureTaken(byte[] data, Camera camera) { // data参数值就是照片数据，将这些数据以key-value形式保存，以便其他调用该Activity的程序可 // 以获得照片数据 try { Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length); File file = new File(Environment.getExternalStorageDirectory() + "/ms/prj", System.currentTimeMillis() + ".png"); // 用流的方式保存图片 FileOutputStream outStream = new FileOutputStream(file); bitmap.compress(CompressFormat.PNG, 100, outStream); outStream.close(); // 停止照片拍摄 camera.stopPreview(); camera.release(); // 并重新启动预拍 camera.startPreview(); } catch (Exception e) { Log.e(TAG, e.toString()); } } } ShutterCallback sc = new ShutterCallback() { @Override public void onShutter() { // TODO Auto-generated method stub Toast.makeText(MainActivity.this, "capture成功！", Toast.LENGTH_SHORT) .show(); } }; public boolean onTouchEvent(MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_DOWN) // 结束拍照 camera.autoFocus(new AutoFocusCallback() { @Override public void onAutoFocus(boolean success, Camera camera) { // TODO Auto-generated method stub // success为true表示对焦成功 if (success) { camera.takePicture(sc, null, new TakePictureCallback()); } } }); return super.onTouchEvent(event); } // 创建菜单项 @Override public boolean onCreateOptionsMenu(Menu menu) { // TODO Auto-generated method stub super.onCreateOptionsMenu(menu); // menu.add(0, 0, 0, "选择日期").setIcon(R.drawable.menu_date); menu.add(0, 0, 0, "拍照").setIcon(android.R.drawable.ic_menu_camera); return super.onCreateOptionsMenu(menu); } // 菜单的点击事件 @Override public boolean onOptionsItemSelected(MenuItem item) { // TODO Auto-generated method stub switch (item.getItemId()) { // 返回今天菜单项的点击事件 case 0: { camera.autoFocus(new AutoFocusCallback() { @Override public void onAutoFocus(boolean success, Camera camera) { // TODO Auto-generated method stub // success为true表示对焦成功 if (success) { camera.takePicture(null, null, new TakePictureCallback()); } } }); break; } } return true; } }