android实现定时拍照功能

在手机上面实现，设置一段时间（以秒计时）之后，自动拍照，适用于摄影师建立一个场景，之后设置时间，再进入场景。

界面主要就是一个设置时间的EditText和启动倒计时的Button，设置完时间之后，点击倒计时按钮。

<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> 

在清单文件中加入权限：

<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" /> 

主程序：

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();
  } 

}

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