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   源码介绍

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package com.example.camera;

import java.io.File;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.view.Display;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity {
	final static int CAMERA_RESULT = 0;
	ImageView mImagevView;
	String imageFilePath;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		Button Tv = (Button) findViewById(R.id.button1);

		Tv.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View view) {
				imageFilePath = Environment.getExternalStorageDirectory()
						.getAbsolutePath()   "/myfavoritepicture.jpg";
				File imageFile = new File(imageFilePath);
				Uri imageFileUri = Uri.fromFile(imageFile);
				Intent i = new Intent(
						android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
				i.putExtra(android.provider.MediaStore.EXTRA_OUTPUT,
						imageFileUri);

				startActivityForResult(i, CAMERA_RESULT);
			}
		});
	}

	protected void onActivityResult(int requestCode, int resultCode,
			Intent intent) {
		super.onActivityResult(requestCode, resultCode, intent);
		if (resultCode == RESULT_OK) {
			Display currentDisplay = getWindowManager().getDefaultDisplay();
			int dw = currentDisplay.getWidth();
			int dh = currentDisplay.getHeight();

			BitmapFactory.Options options = new BitmapFactory.Options();
			options.inJustDecodeBounds = true;
			Bitmap bmp = BitmapFactory.decodeFile(imageFilePath, options);
			int heightRatio = (int) Math.ceil(options.outHeight / (float) dh);
			int widthRatio = (int) Math.ceil(options.outWidth / (float) dw);
			if (heightRatio > 1 && widthRatio > 1) {
				if (heightRatio > widthRatio) {
					options.inSampleSize = heightRatio;
				} else {
					options.inSampleSize = widthRatio;
				}
			}
			options.inJustDecodeBounds = false;
			bmp = BitmapFactory.decodeFile(imageFilePath, options);
			mImagevView.setImageBitmap(bmp);
		}
	}
}