我的应用中有一个包含图像的gridView。图像通过网络从json加载。我希望当用户点击gridView中的任何图像时，新活动将打开容器，用户点击该图像。图像从json中定义的链接加载。我试过但没有得到理想的结果。
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;
import com.dragedy.dream.adapter.MyArrayAdapter;
import com.dragedy.dream.model.MyDataModel;
import com.dragedy.dream.parser.JSONParser;
import com.dragedy.dream.utils.InternetConnection;
import com.dragedy.dream.utils.Keys;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
public class memechoose extends AppCompatActivity {
private GridView gridView;
private ArrayList<MyDataModel> list;
private MyArrayAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_memechoose);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
/**
* Array List for Binding Data from JSON to this List
*/
list = new ArrayList<>();
/**
* Binding that List to Adapter
*/
adapter = new MyArrayAdapter(this, list);
/**
* Getting List and Setting List Adapter
*/
gridView = (GridView) findViewById(R.id.gridView);
gridView.setAdapter(adapter);
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent i= new Intent(memechoose.this, MemeEditorActivity.class);
i.putExtra("image_path", list.get(position).getImage());
startActivity(i);
}
});
/**
* Just to know onClick and Printing Hello Toast in Center.
*/
if (InternetConnection.checkConnection(getApplicationContext())) {
new GetDataTask().execute();
}
}
/**
* Creating Get Data Task for Getting Data From Web
*/
class GetDataTask extends AsyncTask<Void, Void, Void> {
ProgressDialog dialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
/**
* Progress Dialog for User Interaction
*/
dialog = new ProgressDialog(memechoose.this);
dialog.setTitle("Hey Wait Please...");
dialog.setMessage("I am getting your JSON");
dialog.show();
}
@Nullable
@Override
protected Void doInBackground(Void... params) {
/**
* Getting JSON Object from Web Using okHttp
*/
JSONObject jsonObject = JSONParser.getDataFromWeb();
try {
/**
* Check Whether Its NULL???
*/
if (jsonObject != null) {
/**
* Check Length...
*/
if(jsonObject.length() > 0) {
/**
* Getting Array named "contacts" From MAIN Json Object
*/
JSONArray array = jsonObject.getJSONArray(Keys.KEY_MEME);
/**
* Check Length of Array...
*/
int lenArray = array.length();
if(lenArray > 0) {
for(int jIndex = 0; jIndex < lenArray; jIndex++) {
/**
* Creating Every time New Object
* and
* Adding into List
*/
MyDataModel model = new MyDataModel();
/**
* Getting Inner Object from contacts array...
* and
* From that We will get Name of that Contact
*
*/
JSONObject innerObject = array.getJSONObject(jIndex);
String image = innerObject.getString(Keys.KEY_MEME_PIC);
/**
* Getting Object from Object "phone"
*/
model.setImage(image);
/**
* Adding name and phone concatenation in List...
*/
list.add(model);
}
}
}
} else {
}
} catch (JSONException je) {
Log.i(JSONParser.TAG, "" + je.getLocalizedMessage());
}
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
dialog.dismiss();
/**
* Checking if List size if more than zero then
* Update ListView
*/
if(list.size() > 0) {
adapter.notifyDataSetChanged();
} //else {
// Snackbar.make(findViewById(R.id.parentLayout), "No Data Found", Snackbar.LENGTH_LONG).show();
// }
}
}
}
以及我想要显示图像的活动如下：
public class MemeEditorActivity extends AppCompatActivity {
private Toolbar toolbar;
private MemeEditorActivity selfRef;
private SharedPreferences setting;
private LinearLayout linlaHeaderProgress;
private float memeEditorLayoutWidth;
private float memeEditorLayoutHeight;
private LinearLayout tutorial;
private LinearLayout memeEditorLayout;
private MemeEditorView memeEditorView;
private ImageView forwardButtonImageView;
private Bitmap memeBitmap;
private File cacheImage_forPassing;
private File myDir;
private String dataDir;
private boolean firsttimes;
private boolean tutorialPreference;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_meme_editor);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(false);
selfRef = this;
// Transparent bar on android 4.4 or above
if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.KITKAT)
{
Window window = getWindow();
// Translucent status bar
window.setFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS,
WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
// Translucent navigation bar
window.setFlags(
WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION,
WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
}
// Initialize progress bar
linlaHeaderProgress = (LinearLayout)findViewById(R.id.linlaHeaderProgress);
linlaHeaderProgress.bringToFront();
// Initialize tutorial
setting = PreferenceManager
.getDefaultSharedPreferences(MemeEditorActivity.this);
SharedPreferences prefre = getSharedPreferences("Meme_Pref", Context.MODE_PRIVATE);
firsttimes = prefre.getBoolean("Meme_Pref", true);
tutorialPreference = setting.getBoolean("Tutor_Preference", false);
SharedPreferences.Editor firstTimeEditor = prefre.edit();
// See if tutorial is needed to be shown
tutorial = (LinearLayout)findViewById(R.id.meme_editor_tutorial);
tutorial.setEnabled(false);
tutorial.setOnClickListener(new View.OnClickListener()
{
@ Override
public void onClick(View view)
{
tutorial.setVisibility(View.GONE);
tutorial.setEnabled(false);
}
});
if(firsttimes)
{
tutorial.setVisibility(View.VISIBLE);
tutorial.bringToFront();
tutorial.setEnabled(true);
firstTimeEditor.putBoolean("Meme_Pref", false);
firstTimeEditor.commit();
}
else if(tutorialPreference)
{
tutorial.setVisibility(View.VISIBLE);
tutorial.bringToFront();
tutorial.setEnabled(true);
tutorialPreference = setting.getBoolean("Tutor_Preference", false);
}
else
{
tutorial.setVisibility(View.GONE);
tutorial.setEnabled(false);
}
// Get the data directory for the app
PackageManager m = getPackageManager();
dataDir = getPackageName();
try
{
PackageInfo p = m.getPackageInfo(dataDir, 0);
dataDir = p.applicationInfo.dataDir;
myDir = new File(dataDir+"/cache");
if(!myDir.exists())
myDir.mkdirs();
if(myDir.setWritable(true))
Log.i("meme", "myDir is writable");
else
Log.i("meme", "myDir is not writable");
}catch(PackageManager.NameNotFoundException e)
{
Log.w("yourtag", "Error Package name not found ", e);
}
// Get the intent and get the image path to be the meme image
Intent shareIntent = getIntent();
String imagePath = shareIntent.getStringExtra("image_path");
// Create the SandboxView
setting = PreferenceManager
.getDefaultSharedPreferences(MemeEditorActivity.this);
// final int memeSize = Integer.valueOf(setting.getString("image_size","720"));
final int memeSize = setting.getInt("image_size", 720);
Log.i("meme", "memeSize = "+memeSize);
memeEditorLayout = (LinearLayout)findViewById(R.id.memeEditorLayout);
memeEditorLayout.setGravity(Gravity.CENTER);
try
{
Log.i("imagePath", imagePath);
Bitmap bitmap = BitmapFactory.decodeFile(imagePath);
memeEditorView = new MemeEditorView(this, bitmap);
memeEditorView.setLayoutParams(new ViewGroup.LayoutParams(memeSize, memeSize));
// Scale the sand box and add it into the layout
ViewTreeObserver viewTreeObserver = memeEditorLayout
.getViewTreeObserver();
// For getting the width and height of a dynamic layout during
// onCreate
viewTreeObserver
.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener()
{
@RequiresApi(api = Build.VERSION_CODES.HONEYCOMB)
@ Override
public void onGlobalLayout()
{
memeEditorLayout.getViewTreeObserver()
.removeGlobalOnLayoutListener(this);
memeEditorLayoutWidth = memeEditorLayout.getHeight();
memeEditorLayoutHeight = memeEditorLayout.getWidth();
float scalingFactor = memeEditorLayoutWidth/(float)memeSize;
Log.i("memeEditorLayoutWidth", Float.toString(memeEditorLayoutWidth));
Log.i("ScaleFactor", Float.toString(scalingFactor));
memeEditorView.setScaleX(scalingFactor);
memeEditorView.setScaleY(scalingFactor);
}
});
memeEditorLayout.addView(memeEditorView);
// Set save button on click method
forwardButtonImageView = (ImageView)findViewById(R.id.forwardButtonImage);
forwardButtonImageView.setOnClickListener(new View.OnClickListener()
{
@ Override
public void onClick(View arg0)
{
forwardButtonImageView.setEnabled(false);
Forward forward = new Forward();
forward.execute();
}
});
}catch(OutOfMemoryError e)
{
Toast.makeText(selfRef, "Your device is out of memory.", Toast.LENGTH_LONG).show();
finish();
}catch(Exception e)
{
Log.i("Meme Editor Activity", e.toString());
Toast.makeText(selfRef, "Ops, something went wrong.", Toast.LENGTH_LONG).show();
finish();
}
}
// Delete a files
private void deleteFile(File file)
{
if(file!=null)
{
Log.i("deleteFile", file.toString()+((file.exists())?" is Exist.":"is not exist!!!!"));
// Check if the file exist
if(file.exists())
// Clear the file inside if it is a directory
if(file.isDirectory())
{
String[] children = file.list();
for(int i = 0;i<children.length;i++)
{
File f = new File(file, children[i]);
if(f.delete())
Log.i("deleteFile", f.getAbsolutePath()+" is deleted....");
else
Log.i("deleteFile", f.getAbsolutePath()+" is not deleted!!!!");
}
}
}
}
@ Override
protected void onPause()
{
// Hide the progress bar
linlaHeaderProgress.setVisibility(View.GONE);
forwardButtonImageView.setEnabled(true);
super.onPause();
}
@ Override
protected void onResume()
{
super.onResume();
memeEditorView.setEnabled(true);
memeEditorView.resume();
}
@ Override
protected void onDestroy()
{
// Try to delete cache if possible
// deleteFile(myDir);
// bp_release();
//memeEditorView.destroyDrawingCache();
super.onDestroy();
}
@ Override
public boolean onCreateOptionsMenu(Menu menu)
{
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.meme_editor, menu);
return true;
}
@ Override
public boolean onOptionsItemSelected(MenuItem item)
{
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
switch(item.getItemId())
{
case R.id.reset_sandbox:
memeEditorView.reset();
return true;
case R.id.action_settings:
Intent intent = new Intent(selfRef, MainActivity.class);
startActivity(intent);
return true;
case android.R.id.home:
// When the action bar icon on the top right is clicked, finish this
// activity
this.finish();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
// save image to a specific places
private void saveImage()
{
// Create the file path and file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String fname = timeStamp+".png";
cacheImage_forPassing = new File(myDir, fname);
// Remove duplicates
if(cacheImage_forPassing.exists())
cacheImage_forPassing.delete();
// Try save the bitmap
try
{
FileOutputStream out = new FileOutputStream(cacheImage_forPassing);
memeBitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
out.flush();
out.close();
Log.i("memeCacheLocation", cacheImage_forPassing.toString());
}catch(Exception e)
{
e.printStackTrace();
}
}
// Async task for onClick
class Forward extends AsyncTask<Object,Object,Object>
{
// Before forwarding
@ Override
protected void onPreExecute()
{
super.onPreExecute();
linlaHeaderProgress.setVisibility(View.VISIBLE);
linlaHeaderProgress.bringToFront();
memeEditorView.pause();
memeEditorView.invalidate();
}
// Forwarding
@ Override
protected String doInBackground(Object ... arg0)
{
Intent forward = new Intent(selfRef, MainActivity.class);
memeEditorView.setDrawingCacheEnabled(true);
memeEditorView.buildDrawingCache();
memeBitmap = Bitmap.createBitmap(memeEditorView.getDrawingCache());
saveImage();
forward.putExtra("cs4295.memcreator.memeImageCache",
cacheImage_forPassing.getPath());
startActivity(forward);
memeEditorView.setDrawingCacheEnabled(false);
return "DONE";
}
// After forwarding
@ Override
protected void onPostExecute(Object result)
{
linlaHeaderProgress.setVisibility(View.GONE);
super.onPostExecute(result);
}
}
// Clear the Bitmap from memory
private void bp_release()
{
if(memeBitmap!=null&&!memeBitmap.isRecycled())
{
memeBitmap.recycle();
memeBitmap = null;
}
}
}
答案 0 :(得分：0)
@ AC-OpenSource E / BitmapFactory：无法解码流： java.io.FileNotFoundException： /http:/static2.businessinsider.com/image/56e3189152bcd0320c8 b5cf7-480 /萨米 - 笑容ER成功 - 孩子 - meme. JPG： 打开失败：ENOENT（没有这样的文件或目录）
你在http
之前有一个斜杠