mainActivity如下:

package cn.testcamera;

import java.io.File;

import java.text.SimpleDateFormat;

import java.util.Date;

import android.app.Activity;

import android.content.ContentResolver;

import android.content.ContentUris;

import android.content.Intent;

import android.database.Cursor;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import .Uri;

import android.os.Bundle;

import android.provider.MediaStore;

import android.view.View;

import android.widget.Button;

import android.widget.ImageView;

public class MainActivity extends Activity {

private Button mButton;

private ImageView mImageView;

private File mPhotoFile;

private String mPhotoPath;

private Uri mPhotoOnSDCardUri;

public final static int CAMERA_RESULT=777;

public final static int CAMERA_RESULT_CUT=888;

public final static int CAMERA_RESULT_CUT_OVER=999;

public final static String TAG="xx";

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(yout.main);

mButton = (Button) findViewById(R.id.button);

mButton.setOnClickListener(new ButtonOnClickListener());

mImageView = (ImageView) findViewById(R.id.imageView);

}

private class ButtonOnClickListener implements View.OnClickListener {

public void onClick(View v) {

try {

Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");

mPhotoPath="mnt/sdcard/DCIM/Camera/"+getPhotoFileName();

mPhotoFile = new File(mPhotoPath);

if (!mPhotoFile.exists()) {

mPhotoFile.createNewFile();

}

mPhotoOnSDCardUri=Uri.fromFile(mPhotoFile);

intent.putExtra(MediaStore.EXTRA_OUTPUT, mPhotoOnSDCardUri);

//拍照后显示此图片

//startActivityForResult(intent,CAMERA_RESULT);

//拍照后先修改再显示此图片

startActivityForResult(intent,CAMERA_RESULT_CUT);

} catch (Exception e) {

}

}

}

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

super.onActivityResult(requestCode, resultCode, data);

//1 拍照后显示照片

if (requestCode==CAMERA_RESULT) {

Bitmap bitmap = BitmapFactory.decodeFile(mPhotoPath, null);

mImageView.setImageBitmap(bitmap);

}

//2 拍照后剪切照片,然后显示

//2.1拍照且剪裁

if (requestCode == CAMERA_RESULT_CUT) {

Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE,mPhotoOnSDCardUri);

sendBroadcast(intent);

try {

Thread.sleep(2000);

} catch (InterruptedException e) {

e.printStackTrace();

}

Uri systemImageUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;

ContentResolver contentResolver = getContentResolver();

Cursor cursor = contentResolver.query(systemImageUri, null,

MediaStore.Images.Media.DISPLAY_NAME + "='"

+ mPhotoFile.getName() + "'", null, null);

Uri photoUriInMedia = null;

if (cursor != null && cursor.getCount() > 0) {

cursor.moveToLast();

long id = cursor.getLong(0);

photoUriInMedia = ContentUris.withAppendedId(systemImageUri, id);

}

cursor.close();

Intent in = new Intent("com.android.camera.action.CROP");

//需要裁减的图片格式

in.setDataAndType(photoUriInMedia, "image/*");

//允许裁减

in.putExtra("crop", "true");

//剪裁后ImageView显时图片的宽

in.putExtra("outputX", 250);

//剪裁后ImageView显时图片的高

in.putExtra("outputY", 250);

//设置剪裁框的宽高比例

in.putExtra("aspectX", 1);

in.putExtra("aspectY", 1);

in.putExtra("return-data", true);

startActivityForResult(in, CAMERA_RESULT_CUT_OVER);

}

//2.2显示

if (requestCode==CAMERA_RESULT_CUT_OVER) {

//剪切图片的时候,若"放弃"则回答的data为null

if (data!=null) {

Bitmap bitmap = (Bitmap) data.getExtras().get("data");

mImageView.setImageBitmap(bitmap);

}

}

}

private String getPhotoFileName() {

Date date = new Date(System.currentTimeMillis());

SimpleDateFormat dateFormat = new SimpleDateFormat("'IMG'_yyyyMMdd_HHmmss");

return dateFormat.format(date) + ".jpg";

}

}

main.xml如下:

<RelativeLayout xmlns:android="/apk/res/android" xmlns:tools="/tools" android:layout_width="match_parent" android:layout_height="match_parent" > <Button android:id="@+id/button" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="点击按钮拍照" /> <ImageView android:id="@+id/imageView" android:layout_below="@id/button" android:layout_width="fill_parent" android:layout_height="wrap_content" /> </RelativeLayout>