Android 如何使用位图数组设置ImageView
我正在做一个通过Android 如何使用位图数组设置ImageView,android,bitmap,imageview,Android,Bitmap,Imageview,我正在做一个通过JSON获取图像URL的演示，在获取ULR之后，我将下载这些图像并将它们显示到GridView中。为了存储下载的图像，我使用Bitmap数组并将其传递给ImageAdapter。现在我想在下一个活动的ImageView上显示这些图像，因为我在第二个活动中使用了下面的代码 // get intent data Intent i = getIntent(); // Selected image id int position = i.getEx
JSONULRGridViewBitmapImageAdapterImageView // get intent data
Intent i = getIntent();
// Selected image id
int position = i.getExtras().getInt("id");
ImageAdapter imageAdapter = new ImageAdapter(this);
ImageView imageView = (ImageView) findViewById(R.id.full_image_view);
imageView.setBackgroundDrawable(imageAdapter.bm[position]);
的错误，类型ImageView中的方法setImageDrawable（Drawable）不适用于参数（位图）BitmapImageView public class ImageAdapter extends BaseAdapter {
private Context mContext;
public Bitmap bm[]=new Bitmap[4];
ImageView imageView;
// Constructor
public ImageAdapter(Context c, Bitmap[] bm){
mContext = c;
this.bm = bm;
}
public ImageAdapter(Context c) {
mContext = c;
}
@Override
public int getCount() {
return bm.length;
}
@Override
public Object getItem(int position) {
return bm[position];
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
imageView = new ImageView(mContext);
imageView.setImageBitmap(bm[position]);
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setLayoutParams(new GridView.LayoutParams(70, 70));
return imageView;
}
}
public class AndroidGridLayoutActivity extends Activity {
public static final Bitmap bm[]=new Bitmap[4];
public static ImageAdapter img;
public static String[] imageurls;
public static GridView gridView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.grid_layout);
Log.d("LOG", "1");
new GetImageUrls().execute();
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
Log.d("LOG", "7");
gridView = (GridView) findViewById(R.id.grid_view);
// Instance of ImageAdapter Class
Log.d("LOG", "8");
img = new ImageAdapter(getApplicationContext(), bm);
Log.d("LOG", "9");
gridView.setAdapter(img);
Log.d("LOG", "10");
/**
* On Click event for Single Gridview Item
* */
gridView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
Log.d("LOG", "11");
// Sending image id to FullScreenActivity
Intent i = new Intent(getApplicationContext(), FullImageActivity.class);
Log.d("LOG", "12");
// passing array index
i.putExtra("id", position);
startActivity(i);
}
});
}
public class GetImageUrls extends AsyncTask<Void, Void, Void>
{
Context context;
private ProgressDialog pDialog;
// URL to get JSON
private static final String url= "http://xxx.x.xxx/demo/test.json";
private static final String MAIN = "mainCategory";
private static final String IMAGE = "mcatimage";
// JSONArray
JSONArray loginjsonarray=null;
//result from url
protected void onPreExecute() {
Log.d("LOG", "2");
// Showing progress dialog
pDialog = new ProgressDialog(getApplicationContext());
pDialog.setMessage("Loading...");
pDialog.setCancelable(false);
//pDialog.show();
Log.d("LOG", "3");
}
protected Void doInBackground(Void... arg) {
Log.d("LOG", "4");
// Creating service handler class instance
ServiceHandler sh = new ServiceHandler();
Log.d("LOG", "5");
// Making a request to url and getting response
String jsonstr = sh.makeServiceCall(url, ServiceHandler.POST, null);
Log.d("Response: ", ">"+jsonstr);
if(jsonstr!=null)
{
try {
JSONObject jsonObj =new JSONObject(jsonstr);
loginjsonarray=jsonObj.getJSONArray(MAIN);
imageurls=new String[loginjsonarray.length()];
for(int i=0;i<loginjsonarray.length();i++){
JSONObject l=loginjsonarray.getJSONObject(i);
imageurls[i]=l.getString(IMAGE);
Log.d("imageurls: ", imageurls[i]);
}
for(int i=0;i<imageurls.length;i++)
{
bm[i]=DownloadImage(imageurls[i]);
Log.d("LOG", bm[i].toString());
}
} catch (JSONException e) {
e.printStackTrace();
}
}else{
Toast.makeText(context,"Check your Internet Connection",Toast.LENGTH_SHORT).show();
}
return null;
}
public Bitmap DownloadImage(String STRURL) {
Bitmap bitmap = null;
InputStream in = null;
try {
int response = -1;
URL url = new URL(STRURL);
Log.d("DownloadImage: ", url.toString());
URLConnection conn = url.openConnection();
if (!(conn instanceof HttpURLConnection))
throw new IOException("Not an HTTP connection");
try{
HttpURLConnection httpConn = (HttpURLConnection) conn;
httpConn.setAllowUserInteraction(false);
httpConn.setInstanceFollowRedirects(true);
httpConn.setRequestMethod("GET");
httpConn.connect();
response = httpConn.getResponseCode();
Log.d("DownloadImage response: ", Integer.toString(response));
if (response == HttpURLConnection.HTTP_OK) {
in = httpConn.getInputStream();
Log.d("DownloadImage: ", in.toString());
}
} catch (Exception ex) {
throw new IOException("Error connecting");
}
bitmap = BitmapFactory.decodeStream(in);
Log.d("DownloadImage Bitmap: ", bitmap.toString());
in.close();
}catch (IOException e1) {
e1.printStackTrace();
}
Log.d("LOG", "6");
return bitmap;
}
protected void onPostExecute(Integer result) {
// Dismiss the progress dialog
if(pDialog.isShowing()){
pDialog.dismiss();
}
}
}
}
您应该使用，setImageBitmap（位图bm）方法将位图设置为此ImageView的内容 所以你的代码是
imageView.setImageBitmap(imageAdapter.bm[position]);
您应该使用，设置图像位图（位图bm）方法，将位图设置为此图像视图的内容 所以你的代码是
imageView.setImageBitmap(imageAdapter.bm[position]);
这里，我给你我的应用程序代码，它可以与int position的drawable resources中的gallery一起工作，根据你的需要修改它，应该可以与你的代码一起工作 我在画廊的目的是：
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
int selectedId = imgs[position];
Intent intent = new Intent(Gallery3DActivity.this,MainActivity.class);
intent.putExtra("imageId", selectedId);
startActivity(intent);
}
祝你好运在这里，我给你我的应用程序代码，该应用程序可与具有int位置的可绘图资源中的图库一起使用，根据你的需要进行修改，应该可以与你的代码一起使用 我在画廊的目的是：
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
int selectedId = imgs[position];
Intent intent = new Intent(Gallery3DActivity.this,MainActivity.class);
intent.putExtra("imageId", selectedId);
startActivity(intent);
}
祝你好运，，，，错误消失了，但图像不会显示在下一个活动中如果你在当前活动中设置图像，那么你怎么能在下一个活动中看到这一点，伙计，你想说什么我听不懂，，，错误已消失，但图像未显示在下一个活动中如果您在当前活动中设置图像，那么您如何在下一个活动中看到这一点dude您想说什么我无法理解错误已消失，但图像未显示在下一个活动中尝试imageView.setImageBitmap（getItem[position]）；并发布您的FullImageActivity类。我添加了FullActivity类，请检查。在ImageAdapter的getView（）方法中添加一个日志，看看控件是否到达那里。我认为它不会被执行。让我知道？嘿，我在每一行设置了日志，，，getView（）执行成功..：（错误消失，但图像不会显示在下一个活动中尝试imageView.setImageBitmap（getItem[position]），并发布您的FullImageActivity类。我添加了FullActivity类，请检查。在getView（）中添加日志）方法，并查看控件是否到达那里。我想它没有被执行。让我知道吗？嘿，我在每一行设置了日志，，，getView（）成功执行..：（错误已消失，但图像未在下一个活动中显示运行时有任何错误？或者可能是您有空白位图检查图像是否为空？没有错误，并且图像也已下载..在第二个活动的日志中，图像位置也正确..）：（@Aksh您可以显示位图数组初始化吗？错误已消失，但图像未在下一个活动中显示运行时出现任何错误？或者您可能有空白位图检查图像是否为空？没有错误，并且图像也已下载..在第二个活动中，在日志中，图像位置也正确..：（@Aksh您可以显示位图数组初始化吗？
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
int selectedId = imgs[position];
Intent intent = new Intent(Gallery3DActivity.this,MainActivity.class);
intent.putExtra("imageId", selectedId);
startActivity(intent);
}
Intent avatar = getIntent();
int imageId = avatar.getIntExtra("imageId", -0);
// -0 would be a default value
// -1 will crash with a missing resource
if (getIntent().getExtras() != null) {
Avatar.setImageResource(imageId);
savedAvatar.setImageResource(imageId);
} else {
Avatar.setImageResource(R.mipmap.ic_launcher);
}