摄像头(3)调用系统拍照activity来拍照

 import android.app.Activity;
 import android.content.Intent;
 import android.content.pm.PackageManager;
 import android.graphics.Bitmap;
 import android.os.Bundle;
 import android.provider.MediaStore;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.ImageView;

 /*
  * 调用系统拍照activity来拍照
  */
 public class Main extends Activity implements OnClickListener {

     private ImageView imageView;

     //用系统activity拍照 第1步,检测Android设备是否支持照相机
     private boolean checkCameraHardware(){
         if (getPackageManager().hasSystemFeature(
                        PackageManager.FEATURE_CAMERA)){
             return true;
         }else{
             return false;
         }
     }
     /*
      *拍照按钮事件
      */
     public void onClick(View view) {

         //用系统activity拍照 第2步,准备Intent
         Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
         //用系统activity拍照 第3步,启动activity,注意是startActivityForResult
         startActivityForResult(intent, );
     }

     /*
      *从系统拍照activity返回的函数
      */
     @Override
     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
         //用系统activity拍照 第3步,处理拍照结果
         if (requestCode == ) {
             if (resultCode == Activity.RESULT_OK) {
                 //用系统activity拍照 第4步,取出图片数据
                 Bitmap cameraBitmap = (Bitmap) data.getExtras().get("data");
                 imageView.setImageBitmap(cameraBitmap);
             }
         }
     }

     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);

         Button btnTakePicture = (Button) findViewById(R.id.btnTakePicture);
         btnTakePicture.setOnClickListener(this);

         imageView = (ImageView) findViewById(R.id.imageview);
     }
 }