android图像绘制（六）——获取本地图片或拍照图片

本文地址：/article/8177415.html

从SD卡中获取图片资源，或者拍一张新的图片。

先贴代码

获取图片：



注释：拍照获取的话，可以指定图片的保存地址，在此不说明。

[java] view
plaincopyprint?

CharSequence[] items = {"相册", "相机"};

new AlertDialog.Builder(this)

.setTitle("选择图片来源")

.setItems(items, new OnClickListener() {

public void onClick(DialogInterface dialog, int which) {

if( which == SELECT_PICTURE ){

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);

intent.addCategory(Intent.CATEGORY_OPENABLE);

intent.setType("image/*");

startActivityForResult(Intent.createChooser(intent, "选择图片"), SELECT_PICTURE);

}else{

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

startActivityForResult(intent, SELECT_CAMER);

}

}

})

.create().show();

处理图片，方法一，直接处理返回图片：

[b]注释：[/b]

[b]1、网上有说明，直接处理返回的图片是被系统压缩过的，不过自己在测试的过程并没有区别；

[/b]

[b]2、如果用户不断的重新获取图片的话，必须把现在的Bmp内存释放，否则会报错！ bmp.recycle()。[/b]



[java] view
plaincopyprint?

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

super.onActivityResult(requestCode, resultCode, data);

if(resultCode == RESULT_OK){

//选择图片

Uri uri = data.getData();

ContentResolver cr = this.getContentResolver();

try {

if(bmp != null)//如果不释放的话，不断取图片，将会内存不够

bmp.recycle();

bmp = BitmapFactory.decodeStream(cr.openInputStream(uri));

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

System.out.println("the bmp toString: " + bmp);

imageSV.setBmp(bmp);

}else{

Toast.makeText(SetImageActivity.this, "请重新选择图片", Toast.LENGTH_SHORT).show();

}

}

处理图片，方法二，获得图片的地址再处理：



[java] view
plaincopyprint?

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

super.onActivityResult(requestCode, resultCode, data);

if(resultCode == RESULT_OK){

Uri uri = data.getData();

String [] proj={MediaStore.Images.Media.DATA};

Cursor cursor = managedQuery( uri,

proj, // Which columns to return

null, // WHERE clause; which rows to return (all rows)

null, // WHERE clause selection arguments (none)

null); // Order-by clause (ascending by name)

int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);

cursor.moveToFirst();

String path = cursor.getString(column_index);

bmp = BitmapFactory.decodeFile(path);

System.out.println("the path is :" + path);

}else{

Toast.makeText(SetImageActivity.this, "请重新选择图片", Toast.LENGTH_SHORT).show();

}