android实现定时拍照功能

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  android:id="@+id/frameLayout" 
  android:layout_width="fill_parent" 
  android:layout_height="fill_parent"   
 
  <SurfaceView 
    android:id="@+id/imageView" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" /  
 
  <LinearLayout 
    android:id="@+id/lineLayout" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="vertical"   
 
    <Button 
      android:id="@+id/startBtn" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="@string/startTimer"  
      android:layout_gravity="center_horizontal"/  
     
<!--     <TextView --  
<!--       android:id="@+id/countDowntextView" --  
<!--       android:layout_width="fill_parent" --  
<!--       android:layout_height="fill_parent" --  
<!--       android:layout_gravity="center_horizontal|center_vertical|center" --  
<!--       android:gravity="center_horizontal|center_vertical" --  
<!--       android:text="@string/conutTime" --  
<!--       android:textSize="40sp" /  --  
     
    <EditText 
      android:id="@+id/countDownEditTextView" 
      android:layout_width="fill_parent" 
      android:layout_height="fill_parent" 
      android:layout_gravity="center_horizontal|center_vertical|center" 
      android:gravity="center_horizontal|center_vertical" 
      android:text="@string/conutTime" 
      android:textSize="80sp"  
      android:inputType="number"/  
 
     
  </LinearLayout  
 
</FrameLayout  

<uses-permission android:name="android.permission.CAMERA" /  
<!--下面的可不需要--  
<uses-feature android:name="android.hardware.camera" /  
<uses-feature android:name="android.hardware.camera.autofocus" /  

package cn.yh.cameradelaycontroll; 
import java.io.OutputStream; 
import java.util.Iterator; 
import java.util.List; 
import android.app.Activity; 
import android.content.ContentValues; 
import android.content.res.Configuration; 
import android.hardware.Camera; 
import android.hardware.Camera.PictureCallback; 
import android.net.Uri; 
import android.os.Bundle; 
import android.os.Handler; 
import android.provider.MediaStore.Images.Media; 
import android.text.Editable; 
import android.text.TextWatcher; 
import android.util.Log; 
import android.view.Menu; 
import android.view.SurfaceHolder; 
import android.view.SurfaceView; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.TextView; 
import android.widget.Toast; 
public class MainActivity extends Activity implements SurfaceHolder.Callback, 
OnClickListener, PictureCallback { 
private static final String CAMERA_CONTROLL = "CAMERA_CONTROLL"; 
private SurfaceView imageSView; 
private Button startButton; 
// private TextView countDownTextView; 
private EditText countDownEditTextView; 
private Camera camera; 
private SurfaceHolder surfaceHolder; 
private Handler timerUpdateHandler; 
private boolean timerRunning = false; 
private int currentTimer = 10; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_main); 
imageSView = (SurfaceView) findViewById(R.id.imageView); 
startButton = (Button) findViewById(R.id.startBtn); 
// countDownTextView = (TextView) findViewById(R.id.countDowntextView); 
countDownEditTextView = (EditText) findViewById(R.id.countDownEditTextView); 
/* 
countDownEditTextView.addTextChangedListener(new TextWatcher() { 
@Override 
public void onTextChanged(CharSequence s, int start, int before, 
int count) { 
// TODO Auto-generated method stub 
} 
@Override 
public void beforeTextChanged(CharSequence arg0, int arg1, 
int arg2, int arg3) { 
// TODO Auto-generated method stub 
} 
@Override 
public void afterTextChanged(Editable arg0) { 
// TODO Auto-generated method stub 
currentTimer = Integer.parseInt(countDownEditTextView.getText().toString()); 
} 
}); 
*/ 
surfaceHolder = imageSView.getHolder(); 
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); 
surfaceHolder.addCallback(this); 
startButton.setOnClickListener(this); 
timerUpdateHandler = new Handler(); 
} 
@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
// Inflate the menu; this adds items to the action bar if it is present. 
getMenuInflater().inflate(R.menu.main, menu); 
return true; 
} 
@Override 
public void onPictureTaken(byte[] data, Camera camera) { 
// TODO Auto-generated method stub 
Uri imageFileUri = getContentResolver().insert( 
Media.EXTERNAL_CONTENT_URI, new ContentValues()); 
try { 
OutputStream imageFileOS = getContentResolver().openOutputStream( 
imageFileUri); 
imageFileOS.write(data); 
imageFileOS.flush(); 
imageFileOS.close(); 
} catch (Exception e) { 
// TODO Auto-generated catch block 
Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show(); 
} 
camera.startPreview(); 
} 
@Override 
public void onClick(View v) { 
// TODO Auto-generated method stub 
currentTimer = Integer.parseInt(countDownEditTextView.getText().toString()); 
switch (v.getId()) { 
case R.id.startBtn: 
if (!timerRunning) { 
timerRunning = true; 
timerUpdateHandler.post(timerUpdateTask); 
} 
break; 
} 
} 
private Runnable timerUpdateTask = new Runnable() { 
@Override 
public void run() { 
// TODO Auto-generated method stub 
if (currentTimer   1) { 
currentTimer--; 
timerUpdateHandler.postDelayed(timerUpdateTask, 1000); 
} else { 
camera.takePicture(null, null, null, MainActivity.this); 
timerRunning = false; 
currentTimer = 10; 
} 
countDownEditTextView.setText(currentTimer + ""); 
} 
}; 
@Override 
public void surfaceChanged(SurfaceHolder holder, int format, int width, 
int height) { 
// TODO Auto-generated method stub 
camera.startPreview(); 
} 
@Override 
public void surfaceCreated(SurfaceHolder holder) { 
// TODO Auto-generated method stub 
int cameraNums = Camera.getNumberOfCameras(); 
Log.e(CAMERA_CONTROLL, cameraNums + ""); 
try { 
camera = Camera.open(cameraNums - 1); 
} catch (Exception e) { 
Log.e(CAMERA_CONTROLL, e.getMessage()); 
} 
try { 
camera.setPreviewDisplay(holder); 
Camera.Parameters parameters = camera.getParameters(); 
if (this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) { 
parameters.set("orientation", "portrait"); 
camera.setDisplayOrientation(90); 
parameters.setRotation(90); 
} 
List<String  colorEffects = parameters.getSupportedColorEffects(); 
Iterator<String  cei = colorEffects.iterator(); 
while (cei.hasNext()) { 
String currentEffect = cei.next(); 
if (currentEffect.equals(Camera.Parameters.EFFECT_SOLARIZE)) { 
parameters 
.setColorEffect(Camera.Parameters.EFFECT_SOLARIZE); 
break; 
} 
} 
camera.setParameters(parameters); 
} catch (Exception e) { 
// TODO Auto-generated catch block 
// e.printStackTrace(); 
camera.release(); 
} 
} 
@Override 
public void surfaceDestroyed(SurfaceHolder holder) { 
// TODO Auto-generated method stub 
camera.stopPreview(); 
camera.release(); 
} 
}