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   源码介绍

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android 4.4环境测试 从相册选择照片 可用， 拍照的照片提示无法加载

package com.example.camera;

import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageButton;

public class MainActivity extends Activity implements OnClickListener {
private ImageButton img_btn;
private Button btn;
private static final int PHOTO_REQUEST_TAKEPHOTO = 1;// 拍照
private static final int PHOTO_REQUEST_GALLERY = 2;// 从相册中选择
private static final int PHOTO_REQUEST_CUT = 3;// 结果
// 创建一个以当前时间为名称的文件
File tempFile = new File(Environment.getExternalStorageDirectory()  "/Postcard",getPhotoFileName());

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

//初始化控件
private void init() {
img_btn = (ImageButton) findViewById(R.id.imageView1);
btn = (Button) findViewById(R.id.button1);
//为ImageButton和Button添加监听事件
img_btn.setOnClickListener(this);
btn.setOnClickListener(this);
}

//点击事件
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.imageView1:
showDialog();
break;

case R.id.button1:
showDialog();
break;
}

}

//提示对话框方法
private void showDialog() {
new AlertDialog.Builder(this)
.setTitle("头像设置")
.setPositiveButton("拍照", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
dialog.dismiss();
// 调用系统的拍照功能
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// 指定调用相机拍照后照片的储存路径
intent.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(tempFile));
startActivityForResult(intent, PHOTO_REQUEST_TAKEPHOTO);
}
})
.setNegativeButton("相册", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
dialog.dismiss();
Intent intent = new Intent(Intent.ACTION_PICK, null);
intent.setDataAndType(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
"image/*");
startActivityForResult(intent, PHOTO_REQUEST_GALLERY);
}
}).show();
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub

switch (requestCode) {
case PHOTO_REQUEST_TAKEPHOTO://当选择拍照时调用
startPhotoZoom(Uri.fromFile(tempFile), 150);
break;

case PHOTO_REQUEST_GALLERY://当选择从本地获取图片时
//做非空判断，当我们觉得不满意想重新剪裁的时候便不会报异常，下同
if (data != null)
startPhotoZoom(data.getData(), 150);
break;

case PHOTO_REQUEST_CUT://返回的结果
if (data != null)
setPicToView(data);
break;
}
super.onActivityResult(requestCode, resultCode, data);

}

private void startPhotoZoom(Uri uri, int size) {
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/*");
// crop为true是设置在开启的intent中设置显示的view可以剪裁
intent.putExtra("crop", "true");

// aspectX aspectY 是宽高的比例
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);

// outputX,outputY 是剪裁图片的宽高
intent.putExtra("outputX", size);
intent.putExtra("outputY", size);
intent.putExtra("return-data", true);

startActivityForResult(intent, PHOTO_REQUEST_CUT);
}

//将进行剪裁后的图片显示到UI界面上
@SuppressWarnings("deprecation")
private void setPicToView(Intent picdata) {
Bundle bundle = picdata.getExtras();
if (bundle != null) {
Bitmap photo = bundle.getParcelable("data");
Drawable drawable = new BitmapDrawable(photo);
img_btn.setBackgroundDrawable(drawable);
}
}

// 使用系统当前日期加以调整作为照片的名称
private String getPhotoFileName() {
Date date = new Date(System.currentTimeMillis());
SimpleDateFormat dateFormat = new SimpleDateFormat("'IMG'_yyyyMMdd_HHmmss");
return dateFormat.format(date)   ".jpg";
}
}