从相册或者相机获得uri转为bitmap

package com.zhy.sample.demo_recyclerview;


import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.ContentResolver;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;


public class ImageviewBitmap extends Activity {


private ImageView imageView;
private OnClickListener imgViewListener;
Bitmap myBitmap;
private byte[] mContent;


@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
imageView = (ImageView) findViewById(R.id.ivPic);


imgViewListener = new OnClickListener() {
public void onClick(View v) {
final CharSequence[] items = { "相册", "拍照" };
AlertDialog dlg = new AlertDialog.Builder(ImageviewBitmap.this).setTitle("选择图片")
.setItems(items, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int item) {
// 这里item是根据选择的方式，
// 在items数组里面定义了两种方式，拍照的下标为1所以就调用拍照方法
if (item == 1) {
Intent getImageByCamera = new Intent("android.media.action.IMAGE_CAPTURE");
startActivityForResult(getImageByCamera, 1);
} else {
Intent getImage = new Intent(Intent.ACTION_GET_CONTENT);
getImage.addCategory(Intent.CATEGORY_OPENABLE);
getImage.setType("image/jpeg");
startActivityForResult(getImage, 0);
}
}
}).create();
dlg.show();
}
};
// 给imageView控件绑定点点击监听器
imageView.setOnClickListener(imgViewListener);


}


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


ContentResolver resolver = getContentResolver();
/**
* 因为两种方式都用到了startActivityForResult方法，这个方法执行完后都会执行onActivityResult方法，
* 所以为了区别到底选择了那个方式获取图片要进行判断，
* 这里的requestCode跟startActivityForResult里面第二个参数对应
*/
if (requestCode == 0) {
try {
// 获得图片的uri
Uri originalUri = data.getData();
// 将图片内容解析成字节数组
mContent = readStream(resolver.openInputStream(Uri.parse(originalUri.toString())));
// 将字节数组转换为ImageView可调用的Bitmap对象
myBitmap = getPicFromBytes(mContent, null);
//// 把得到的图片绑定在控件上显示
imageView.setImageBitmap(myBitmap);
} catch (Exception e) {
System.out.println(e.getMessage());
}


} else if (requestCode == 1) {
try {
super.onActivityResult(requestCode, resultCode, data);
Bundle extras = data.getExtras();
myBitmap = (Bitmap) extras.get("data");
ByteArrayOutputStream baos = new ByteArrayOutputStream();
myBitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
mContent = baos.toByteArray();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// 把得到的图片绑定在控件上显示
imageView.setImageBitmap(myBitmap);
}


}


public static Bitmap getPicFromBytes(byte[] bytes, BitmapFactory.Options opts) {
if (bytes != null)
if (opts != null)
return BitmapFactory.decodeByteArray(bytes, 0, bytes.length, opts);
else
return BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
return null;
}


public static byte[] readStream(InputStream inStream) throws Exception {
byte[] buffer = new byte[1024];
int len = -1;
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
while ((len = inStream.read(buffer)) != -1) {
outStream.write(buffer, 0, len);
}
byte[] data = outStream.toByteArray();
outStream.close();
inStream.close();
return data;


}
}