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   源码介绍

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package com.android.project;

import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

public class PhontoActivity extends Activity {

	private ImageView iv_image;

	private Button bt_camera;

	private Bitmap photo;

	private File file;

	private String saveDir = Environment.getExternalStorageDirectory()
			.getPath()   "/temp_image";

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.photo_activity);

		iv_image = (ImageView) findViewById(R.id.iv_image);
		bt_camera = (Button) findViewById(R.id.bt_camera);

		bt_camera.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				destoryImage();
				String state = Environment.getExternalStorageState();
				if (state.equals(Environment.MEDIA_MOUNTED)) {
					file = new File(saveDir, "temp.jpg");
					file.delete();
					if (!file.exists()) {
						try {
							file.createNewFile();
						} catch (IOException e) {
							e.printStackTrace();
							Toast.makeText(PhontoActivity.this, "照片创建失败!",
									Toast.LENGTH_LONG).show();
							return;
						}
					}
					Intent intent = new Intent(
							"android.media.action.IMAGE_CAPTURE");
					intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(file));
					startActivityForResult(intent, 1);
				} else {
					Toast.makeText(PhontoActivity.this, "sdcard无效或没有插入!",
							Toast.LENGTH_SHORT).show();
				}
			}
		});

		File savePath = new File(saveDir);
		if (!savePath.exists()) {
			savePath.mkdirs();
		}
	}

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		super.onActivityResult(requestCode, resultCode, data);
		if (requestCode == 1 && resultCode == RESULT_OK) {
			if (file != null && file.exists()) {
				BitmapFactory.Options option = new BitmapFactory.Options();
				option.inSampleSize = 2;
				photo = BitmapFactory.decodeFile(file.getPath(), option);
				iv_image.setImageBitmap(photo);
			}
		}
	}

	@Override
	protected void onDestroy() {
		destoryImage();
		super.onDestroy();
	}

	private void destoryImage() {
		if (photo != null) {
			photo.recycle();
			photo = null;
		}
	}

}