Android 从onactivityresult更新gridview
我有一个网格视图,当用户点击图像时,我会发送启动相机并拍照的意图。从“活动结果”中,我将获得一个图像路径,并从该路径获取图像,现在,如何在网格项的位置更新该图像 这是我的密码:Android 从onactivityresult更新gridview,android,Android,我有一个网格视图,当用户点击图像时,我会发送启动相机并拍照的意图。从“活动结果”中,我将获得一个图像路径,并从该路径获取图像,现在,如何在网格项的位置更新该图像 这是我的密码: public class ImageGrid extends Activity { /** Called when the activity is first created. */ ImageAdapter mAdapter; @Override public void onCrea
public class ImageGrid extends Activity {
/** Called when the activity is first created. */
ImageAdapter mAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
GridView gridview = (GridView) findViewById(R.id.gridview);
mAdapter = new ImageAdapter(this);
gridview.setAdapter(mAdapter);
gridview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
//Toast.makeText(ImageGrid.this, "" + position, Toast.LENGTH_SHORT).show();
((ImageView) v).setImageResource(R.drawable.icon);
startCameraActivity(position);
}
});
}
protected void startCameraActivity(int position)
{
File file = new File("/sdcard/"+ position +".png");
Uri outputFileUri = Uri.fromFile( file );
Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE );
intent.putExtra( MediaStore.EXTRA_OUTPUT, outputFileUri );
startActivityForResult( intent, position );
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
Log.i( "MakeMachine", "resultCode: " + resultCode );
switch( resultCode )
{
case 0:
Log.i( "MakeMachine", "User cancelled" );
break;
case -1:
onPhotoTaken(requestCode);
break;
}
}
protected void onPhotoTaken(int position)
{
Bitmap image = getPreview("/sdcard/"+ position +".png");
// how to update the grid view image.
}
/*
* Create a bitmap image by reading the image data from the path provided.
*/
public Bitmap getPreview(String path) {
File image = new File(path);
BitmapFactory.Options bounds = new BitmapFactory.Options();
bounds.inJustDecodeBounds = true;
BitmapFactory.decodeFile(image.getPath(), bounds);
if ((bounds.outWidth == -1) || (bounds.outHeight == -1))
return null;
int originalSize = (bounds.outHeight > bounds.outWidth) ? bounds.outHeight
: bounds.outWidth;
BitmapFactory.Options opts = new BitmapFactory.Options();
opts.inSampleSize = originalSize / 100;
return BitmapFactory.decodeFile(image.getPath(), opts);
}
public class ImageAdapter extends BaseAdapter {
private Context mContext;
public ImageAdapter(Context c) {
mContext = c;
}
public int getCount() {
return mThumbIds.length;
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
// create a new ImageView for each item referenced by the Adapter
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) { // if it's not recycled, initialize some attributes
imageView = new ImageView(mContext);
imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(8, 8, 8, 8);
} else {
imageView = (ImageView) convertView;
}
imageView.setImageResource(mThumbIds[position]);
return imageView;
}
// references to our images
private Integer[] mThumbIds = {
R.drawable.sample_0, R.drawable.sample_1,
R.drawable.sample_2, R.drawable.sample_3,
R.drawable.sample_4, R.drawable.sample_5,
R.drawable.sample_6, R.drawable.sample_7,
};
}
}
公共类ImageGrid扩展活动{
/**在首次创建活动时调用*/
图像适配器;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
GridView GridView=(GridView)findViewById(R.id.GridView);
mAdapter=新的图像适配器(此);
setAdapter(mAdapter);
setOnItemClickListener(新的OnItemClickListener(){
public void onItemClick(AdapterView父视图、视图v、整型位置、长id){
//Toast.makeText(ImageGrid.this,“+”位置,Toast.LENGTH_SHORT.show();
((ImageView)v.setImageResource(R.drawable.icon);
STARTCAMERA活动(位置);
}
});
}
受保护的void startCameraActivity(内部位置)
{
File File=新文件(“/sdcard/”+position+”.png”);
Uri outputFileUri=Uri.fromFile(文件);
意向意向=新意向(android.provider.MediaStore.ACTION\u IMAGE\u CAPTURE);
intent.putExtra(MediaStore.EXTRA\u输出,outputFileUri);
startActivityForResult(意图、位置);
}
@凌驾
受保护的void onActivityResult(int请求代码、int结果代码、意图数据)
{
Log.i(“MakeMachine”、“resultCode:+resultCode”);
开关(结果代码)
{
案例0:
Log.i(“MakeMachine”、“用户已取消”);
打破
案例1:
已拍照(请求代码);
打破
}
}
拍照时受保护的空隙(内部位置)
{
位图图像=getPreview(“/sdcard/”+position+”.png”);
//如何更新栅格视图图像。
}
/*
*通过从提供的路径读取图像数据来创建位图图像。
*/
公共位图getPreview(字符串路径){
文件映像=新文件(路径);
BitmapFactory.Options bounds=新的BitmapFactory.Options();
bounds.InjustDecodeBunds=true;
BitmapFactory.decodeFile(image.getPath(),bounds);
如果((bounds.outWidth==-1)| |(bounds.outHeight=-1))
返回null;
int originalSize=(bounds.outHeight>bounds.outWidth)?bounds.outHeight
:边界。向外;
BitmapFactory.Options opts=新的BitmapFactory.Options();
opts.inSampleSize=原始大小/100;
返回BitmapFactory.decodeFile(image.getPath(),opts);
}
公共类ImageAdapter扩展了BaseAdapter{
私有上下文;
公共图像适配器(上下文c){
mContext=c;
}
public int getCount(){
返回mThumbIds.length;
}
公共对象getItem(int位置){
返回null;
}
公共长getItemId(int位置){
返回0;
}
//为适配器引用的每个项目创建新的ImageView
公共视图getView(int位置、视图转换视图、视图组父视图){
图像视图图像视图;
如果(convertView==null){//如果它没有被回收,初始化一些属性
imageView=新的imageView(mContext);
setLayoutParams(新的GridView.LayoutParams(85,85));
imageView.setScaleType(imageView.ScaleType.CENTER\U裁剪);
设置填充(8,8,8,8);
}否则{
imageView=(imageView)convertView;
}
setImageResource(mThumbIds[position]);
返回图像视图;
}
//参考我们的图像
私有整数[]mThumbIds={
R.drawable.sample_0,R.drawable.sample_1,
R.drawable.sample_2,R.drawable.sample_3,
R.drawable.sample_4,R.drawable.sample_5,
R.drawable.sample_6,R.drawable.sample_7,
};
}
}
我建议的快速方法是挂起选定的ImageView:
public class ImageGrid extends Activity {
ImageAdapter mAdapter;
ImageView mSelectedView;
@Override
public void onCreate(Bundle savedInstanceState) {
/** ... **/
gridview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
mSelectedView = (ImageView) v;
mSelectedView.setImageResource(R.drawable.icon);
startCameraActivity(position);
}
});
}
不要忘记,您还需要更新ImageAdapter类,以便它在GridView为该位置调用getView()时使用新图像
protected void onPhotoTaken(int position)
{
Bitmap image = getPreview("/sdcard/"+ position +".png");
mSelectedView.setImageBitmap(image);
}