Android实现手机拍照功能

<?xml version="1.0" encoding="utf-8"?><FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="fill_parent"  android:layout_height="fill_parent" >  <SurfaceView    android:id="@+id/surfaceView"    android:layout_width="fill_parent"    android:layout_height="fill_parent" />  <RelativeLayout    android:id="@+id/buttonlayout"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:visibility="gone" >    <Button      android:id="@+id/takepicture"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:layout_alignParentBottom="true"      android:layout_alignParentRight="true"      android:layout_marginRight="5dp"      android:onClick="takepicture"      android:text="@string/takepicture" />    <Button      android:id="@+id/autofocus"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:layout_alignTop="@id/takepicture"      android:layout_marginRight="20dp"      android:layout_toLeftOf="@id/takepicture"      android:onClick="takepicture"      android:text="@string/autofocus" />  </RelativeLayout></FrameLayout>

import java.io.File;import java.io.FileOutputStream;import android.app.Activity;import android.hardware.Camera;import android.hardware.Camera.PictureCallback;import android.os.Bundle;import android.os.Environment;import android.view.MotionEvent;import android.view.SurfaceHolder;import android.view.SurfaceHolder.Callback;import android.view.SurfaceView;import android.view.View;import android.view.ViewGroup;import android.view.Window;import android.view.WindowManager;public class MainActivity extends Activity {  private View layout;  private Camera camera;  @Override  public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    requestWindowFeature(Window.FEATURE_NO_TITLE);    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,        WindowManager.LayoutParams.FLAG_FULLSCREEN);    setContentView(R.layout.main);    layout = this.findViewById(R.id.buttonlayout);    SurfaceView surfaceView = (SurfaceView) this        .findViewById(R.id.surfaceView);    surfaceView.getHolder()        .setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);    surfaceView.getHolder().setFixedSize(176, 144);    surfaceView.getHolder().setKeepScreenOn(true);    surfaceView.getHolder().addCallback(new SurfaceCallback());  }  public void takepicture(View v) {    if (camera != null) {      switch (v.getId()) {      case R.id.takepicture:        camera.takePicture(null, null, new MyPictureCallback());        break;      case R.id.autofocus:        camera.autoFocus(null);        break;      }    }  }  private final class MyPictureCallback implements PictureCallback {    public void onPictureTaken(byte[] data, Camera camera) {      try {        File jpgFile = new File(            Environment.getExternalStorageDirectory(),            System.currentTimeMillis() + ".jpg");        FileOutputStream outStream = new FileOutputStream(jpgFile);        outStream.write(data);        outStream.close();        camera.startPreview();      } catch (Exception e) {        e.printStackTrace();      }    }  }  private final class SurfaceCallback implements Callback {    public void surfaceCreated(SurfaceHolder holder) {      try {        camera = Camera.open();// 打开摄像头        Camera.Parameters parameters = camera.getParameters();        // Log.i("MainActivity", parameters.flatten());        parameters.setPreviewSize(800, 480);        parameters.setPreviewFrameRate(5);        parameters.setPictureSize(1024, 768);        parameters.setJpegQuality(80);        camera.setParameters(parameters);        camera.setPreviewDisplay(holder);        camera.startPreview();// 开始预览      } catch (Exception e) {        e.printStackTrace();      }    }    public void surfaceChanged(SurfaceHolder holder, int format, int width,        int height) {    }    public void surfaceDestroyed(SurfaceHolder holder) {      if (camera != null) {        camera.release();        camera = null;      }    }  }  @Override  public boolean onTouchEvent(MotionEvent event) {    if (event.getAction() == MotionEvent.ACTION_DOWN) {      layout.setVisibility(ViewGroup.VISIBLE);      return true;    }    return super.onTouchEvent(event);  }}

 <uses-permission android:name="android.permission.CAMERA" />  <!-- 在SDCard中创建与删除文件权限 -->  <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />  <!-- 往SDCard写入数据权限 -->  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />