当我滚动 GridView 时，图像会在其中消失。在日志猫它也显示内存不足我不知道我在这里做错了什么。！显示图像也需要很长时间。提前致谢。
BaseActivity.java
public class BaseActivity extends Activity{
private Context context = this;
boolean server_connection = false;
static final Comparator<HashMap<String, String>> byDate = new Comparator<HashMap<String, String>>() {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
public int compare(HashMap<String, String> ord1, HashMap<String, String> ord2) {
Date d1 = null;
Date d2 = null;
try {
if(ord1.get("datetime")!=null){
d1 = sdf.parse(ord1.get("datetime"));
}
else{
d1 = sdf.parse("1970-01-01 00:00:00");
}
if(ord2.get("datetime")!=null){
d2 = sdf.parse(ord2.get("datetime"));
}
else{
d2 = sdf.parse("1970-01-01 00:00:00");
}
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//Log.d("Date", ""+d1+"..........."+d2);
return (d1.getTime() > d2.getTime() ? -1 : 1); //descending
// return (d1.getTime() > d2.getTime() ? 1 : -1); //ascending
}
};
static final Comparator<HashMap<String, String>> byCount = new Comparator<HashMap<String, String>>() {
public int compare(HashMap<String, String> ord1, HashMap<String, String> ord2) {
int c1,c2;
if(ord1.get("download_count")!=null && !ord1.get("download_count").equals("null")){
c1=Integer.parseInt(ord1.get("download_count"));
}
else{c1=0;}
if(ord2.get("download_count")!=null && !ord2.get("download_count").equals("null")){
c2=Integer.parseInt(ord2.get("download_count"));
}
else{c2=0;}
return (c1>c2 ? -1 : 1); //descending
}
};
public boolean isOnline() {
ConnectivityManager cm =
(ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
if (netInfo != null && netInfo.isConnectedOrConnecting()) {
return true;
}
return false;
}
public String prepareWebserviceRequest(String methodname, String[] keys, String[] values) throws JSONException{
String retStr = null;
String strParams = null;
JSONObject json = new JSONObject();
for(int i=0;i<keys.length;i++){
json.put(keys[i],values[i]);
}
JSONObject fJson = new JSONObject();
fJson.put("method_name", methodname);
fJson.put("body", json);
retStr = fJson.toString();
return retStr;
}
public String prepareWebserviceRequestOnlyMethod(String methodname) throws JSONException{
String retStr = null;
String strParams = null;
JSONObject json = new JSONObject();
JSONObject fJson = new JSONObject();
fJson.put("method_name", methodname);
// fJson.put("body", json);
retStr = fJson.toString();
return retStr;
}
public static Bitmap getBitmapFromURL(String src) {
try {
URL url = new URL(src);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input = connection.getInputStream();
Bitmap myBitmap = BitmapFactory.decodeStream(input);
return myBitmap;
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
public Bitmap getResizedBitmap(Bitmap bm, int newHeight, int newWidth) {
int width = bm.getWidth();
int height = bm.getHeight();
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
// CREATE A MATRIX FOR THE MANIPULATION
Matrix matrix = new Matrix();
// RESIZE THE BIT MAP
matrix.postScale(scaleWidth, scaleHeight);
// RECREATE THE NEW BITMAP
Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, false);
return resizedBitmap;
}
class Download extends AsyncTask<String, Void, Bitmap>{
@Override
protected Bitmap doInBackground(String... params) {
// TODO Auto-generated method stub
Bitmap bmp=null;
bmp = getBitmapFromURL(params[0]);
return bmp;
}
}
public void WriteFile(String path,String filename,String data) {
try{
File direct = new File(path);
if(!direct.exists())
{
direct.mkdir();//directory is created;
}
String fpath= path +filename;
File txtfile=new File(fpath);
txtfile.createNewFile();
FileOutputStream fout=new FileOutputStream(txtfile);
OutputStreamWriter myoutwriter=new OutputStreamWriter(fout);
myoutwriter.write(data);
myoutwriter.close();
fout.close();
}
catch(Exception e)
{
e.printStackTrace();
}
}
public String ReadFile(String path,String filename)
{ File myFile = new File(path + filename);
if(!myFile.exists())
{
return null;
}
FileInputStream fIn = null;
try {
fIn = new FileInputStream(myFile);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
BufferedReader myReader = new BufferedReader(
new InputStreamReader(fIn));
String aDataRow = "";
String aBuffer = "";
try {
while ((aDataRow = myReader.readLine()) != null) {
aBuffer += aDataRow + "\n";
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return aBuffer;
}
public boolean FileExist(String filename)
{
String PATH2 = Environment.getExternalStorageDirectory() + "/"+Constant.Alert_Name+filename;
Log.v("log_tag initial path", "PATH: " + PATH2);
File file2 = new File(PATH2);
if(file2.exists()==true)
{
return true;
}
return false;
}
public String callAPI(String strRequest) {
String result = null;
String new_params;
int ResponseCode;
// TODO Auto-generated method stub
try {
JSONObject json = new JSONObject();
HttpParams httpParams = new BasicHttpParams();
httpParams.setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);
httpParams.setParameter(CoreProtocolPNames.HTTP_CONTENT_CHARSET, HTTP.UTF_8);
httpParams.setParameter(CoreProtocolPNames.USER_AGENT, "Apache-HttpClient/Android");
//httpParams.setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 15000);
httpParams.setParameter(CoreConnectionPNames.STALE_CONNECTION_CHECK, false);
SchemeRegistry schemeRegistry = new SchemeRegistry();
schemeRegistry.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80));
schemeRegistry.register(new Scheme("https", SSLSocketFactory.getSocketFactory(), 443));
ThreadSafeClientConnManager cm = new ThreadSafeClientConnManager(httpParams, schemeRegistry);
HttpClient client = new DefaultHttpClient(cm,httpParams);
String url = Constant.WebService_URL;
//String url = "http://192.168.1.3/messages_app/main.php";
URL url1 = new URL(Constant.WebService_URL);
// URL url1 = new URL("http://192.168.1.3/messages_app/main.php");
HttpPost request = new HttpPost(url);
request.setHeader("Content-Type", "application/x-www-form-urlencoded");
new_params =strRequest;
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
//nameValuePairs.add(new BasicNameValuePair("json","{\"method_name\":\"get_all_category\"}"));
nameValuePairs.add(new BasicNameValuePair("json",new_params));
request.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// request.setEntity(new ByteArrayEntity(json.toString().getBytes("UTF8")));
request.setHeader("json", json.toString());
HttpResponse response = client.execute(request);
ResponseCode = response.getStatusLine().getStatusCode();
//Log.d("ResponseCode", ""+ResponseCode);
if(ResponseCode==200){
HttpEntity entity = response.getEntity();
// If the response does not enclose an entity, there is no need
if (entity != null) {
InputStream instream = entity.getContent();
result = RestClient.convertStreamToString(instream);
// Log.i("Read from server", result);
}
}
else if(ResponseCode!=200){
return "Server down";
}
} catch (Throwable t) {
return null;
}
return result;
}
}
LazyAdapter.java
public class LazyAdapter extends BaseAdapter {
private Activity activity;
private String data[];
private LayoutInflater inflater=null;
public ImageLoader imageLoader;
DisplayImageOptions options;
ArrayList<HashMap<String, String>> list;
public LazyAdapter(Activity a,ArrayList<HashMap<String, String>> list) {
this.list=list;
activity = a;
inflater = (LayoutInflater)LayoutInflater.from(a);
File cacheDir = StorageUtils.getOwnCacheDirectory(a, "Download");
// Get singletone instance of ImageLoader
imageLoader = ImageLoader.getInstance();
// Create configuration for ImageLoader (all options are optional)
ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(a)
// You can pass your own memory cache implementation
.memoryCacheExtraOptions(480,800)
.denyCacheImageMultipleSizesInMemory()
.discCacheExtraOptions(480, 480, CompressFormat.PNG, 100)
.discCache(new UnlimitedDiscCache(cacheDir)) // You can pass your own disc cache
.discCacheFileNameGenerator(new HashCodeFileNameGenerator())
.enableLogging()
.build();
// Initialize ImageLoader with created configuration. Do it once.
imageLoader.init(config);
//imageLoader.init(ImageLoaderConfiguration.createDefault(a));
// imageLoader=new ImageLoader(activity.getApplicationContext());
options = new DisplayImageOptions.Builder()
.showStubImage(R.drawable.stub_image)
.cacheInMemory()
// .cacheOnDisc()
.displayer(new RoundedBitmapDisplayer(20))
.build();
}
public int getCount() {
return list.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder vh;
if(convertView==null)
{
vh = new ViewHolder();
convertView= inflater.inflate(R.layout.other, parent,false);
vh.iv=(ImageView)convertView.findViewById(R.id.picture);
vh.pb= (ProgressBar)convertView.findViewById(R.id.pb);
vh.tv = (TextView)convertView.findViewById(R.id.text);
convertView.setTag(vh);
} else {
vh = (ViewHolder) convertView.getTag();
}
// vh.tv.setText("Image in postion ="+position);
if(Global.getCurrent_tab()==1){
vh.tv.setText(""+list.get(position).get("download_count"));
}
display(vh.iv, Constant.img_URL+list.get(position).get("photo_name"), vh.pb);
return convertView;
}
public void display(ImageView img, String url, final ProgressBar pb)
{
imageLoader.displayImage(url, img, options, new ImageLoadingListener() {
@Override
public void onLoadingCancelled() {
// TODO Auto-generated method stub
}
@Override
public void onLoadingComplete(Bitmap arg0) {
// TODO Auto-generated method stub
pb.setVisibility(View.GONE);
}
@Override
public void onLoadingFailed(FailReason arg0) {
// TODO Auto-generated method stub
pb.setVisibility(View.GONE);
}
@Override
public void onLoadingStarted() {
// TODO Auto-generated method stub
pb.setVisibility(View.VISIBLE);
}
});
}
static class ViewHolder
{
ImageView iv;
TextView tv;
ProgressBar pb;
}
}
DefaultGridView.java
public class DefaultGridView extends Activity {
GridView gridView;
Context context=this;
DisplayImageOptions options;
protected ImageLoader imageLoader = ImageLoader.getInstance();
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.latestphotos);
gridView = (GridView) findViewById(R.id.grid_view);
gridView.setAdapter(new LazyAdapter(DefaultGridView.this,Global.getPhotos_list()));
gridView.setOnItemClickListener(new OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> arg0, View arg1,
int position, long arg3) {
String url =Constant.img_URL+Global.getPhotos_list().get(position).get("photo_name");
Intent i = new Intent(DefaultGridView.this, FullImageActivity.class);
i.putExtra("idkey", url); // pass the id
startActivity(i);
}
});
}
}
FullImageActivity.java
public class FullImageActivity extends Activity {
Button download, setaswallpaper, reportissue;
String url1;
Bitmap myBitmap;
ImageDownloader mDownloader;
FileOutputStream fos;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.full_image);
setaswallpaper = (Button) findViewById(R.id.setaswallpaper);
download = (Button)findViewById(R.id.download);
reportissue = (Button)findViewById(R.id.reportissue);
final ImageView imageView = (ImageView) findViewById(R.id.full_image_view);
url1 = getIntent().getStringExtra("idkey"); //get id
Log.i(".............",""+url1);
//imageView.setImageResource(id);
new Thread( new Runnable()
{
@Override
public void run() {
// TODO Auto-generated method stub
try
{
URL url = new URL(url1.toString());
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input = connection.getInputStream();
myBitmap = BitmapFactory.decodeStream(input);
}
catch(Exception e)
{
e.printStackTrace();
}
runOnUiThread( new Runnable()
{
@Override
public void run() {
// TODO Auto-generated method stub
imageView.setImageBitmap(myBitmap);
}
});
}
}).start();
setaswallpaper.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
WallpaperManager myWallpaperManager
= WallpaperManager.getInstance(getApplicationContext());
try {
myWallpaperManager.setBitmap(myBitmap);
Toast.makeText(getApplicationContext(), "Wallpaper has been set...!!", Toast.LENGTH_LONG).show();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
download.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
try {
saveImageToSD();
// Toast.makeText(getApplicationContext(), "Wallpaper has been Downloaded...!!", Toast.LENGTH_LONG).show();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
reportissue.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_SENDTO); // it's not ACTION_SEND
intent.setType("text/plain");
intent.putExtra(Intent.EXTRA_SUBJECT, "Report Issue");
intent.putExtra(Intent.EXTRA_TEXT, "Body of email");
intent.setData(Uri.parse("mailto:reportissue@gmail.com")); // or just "mailto:" for blank
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); // this will make such that when user returns to your app, your app is displayed, instead of the email app.
startActivity(intent);
}
});
}
private void saveImageToSD() {
/*--- this method will save your downloaded image to SD card ---*/
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
/*--- you can select your preferred CompressFormat and quality.
* I'm going to use JPEG and 100% quality ---*/
myBitmap.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
/*--- create a new file on SD card ---*/
long current = System.currentTimeMillis();
File file = new File(Environment.getExternalStorageDirectory()
+ File.separator + (current / 1000) + "wallpaper.jpg");
try {
file.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
/*--- create a new FileOutputStream and write bytes to file ---*/
try {
fos = new FileOutputStream(file);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
try {
fos.write(bytes.toByteArray());
fos.close();
Toast.makeText(this, "Image saved", Toast.LENGTH_SHORT).show();
} catch (IOException e) {
e.printStackTrace();
}
}
}