调用MediaScannerConnection发起扫描时经常会发生内存泄露，例如：
E ActivityThread: Activity FolderListActivity has leaked ServiceConnection android.media.MediaScannerConnection@ec2a697 that was originally bound here
从网上看到一种解决方法，就是把MediaScannerConnection单独放在一个类中，而不是直接在Activity中创建。
参考网址：
http://www.dreamincode.net/forums/topic/289977-service-connection-leak-error/
1.有问题的代码：
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.createfile);
setupVariables();
checkState();
//Locates the SD Card's path to create a new directory
//If the directory does not exist, then it is created
path = new File(Environment.getExternalStorageDirectory(), dirName);
if(!path.exists()){
path.mkdirs();
}
//if you can read and write to storage
if (wEnable && rEnable) {
// Can Read and Write
confirm.setonclickListener(this);
// creates the library file
save.setonclickListener(this);
}
}
private void setupVariables() {
//The Variables are stored here
}
private void checkState() {
//Checks the state of the external storage. Not relevant to the problem
}
public void onclick(View v) {
switch (v.getId()) {
case R.id.bConfirm:
name = tv.getText().toString();
if (name.equals("")) {
error.setVisibility(View.VISIBLE);
}
else {
error.setVisibility(View.INVISIBLE);
save.setVisibility(View.VISIBLE);
}
break;
case R.id.bSave:
name = tv.getText().toString() + ".txt";
library = new File(path, name);
//This is where the problem occurs
MediaScannerConnection.scanFile(FileCreation.this, new String[]{library.toString()},
null, new MediaScannerConnection.OnScanCompletedListener() {
public void onScanCompleted(String path, Uri uri) {
// TODO Auto-generated method stub
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(FileCreation.this,
"Media scan completed",
Toast.LENGTH_SHORT).show();
}
});
}
});
finish();
break;
}
}
2.建议的代码：
You are creating a media scanner and running it and then calling finish(); while the service is still connected!
Create the following class :
import java.io.File;
import android.content.Context;
import android.media.MediaScannerConnection;
import android.media.MediaScannerConnection.MediaScannerConnectionClient;
import android.net.Uri; public class SingleMediaScanner implements MediaScannerConnectionClient { public interface ScanListener{
public void onScanFinish();
} private MediaScannerConnection mMs;
private File mFile;
private ScanListener listener; public SingleMediaScanner(Context context, File f,ScanListener l) {
listener = l;
mFile = f;
mMs = new MediaScannerConnection(context, this);
mMs.connect();
} @Override
public void onMediaScannerConnected() {
mMs.scanFile(mFile.getAbsolutePath(), null);
} @Override
public void onScanCompleted(String path, Uri uri) {
mMs.disconnect();
listener.onScanFinish();
} }
Then in your code do the following:
new SingleMediaScanner(<context>,<File go here>,new ScanListener(){
public void onScanFinish()
{
finish();
Toast.makeText(FileCreation.this,"Media scan completed",Toast.LENGTH_SHORT).show();
});
3.修改后的代码：
package com.maclinCode; import java.io.File; import android.app.Activity;
import android.media.MediaScannerConnection;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.view.View.onclickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast; import com.maclinCode.SingleMediaScanner.ScanListener; public class FileCreation extends Activity implements onclickListener {
EditText tv;
TextView error;
Button save, confirm;
boolean wEnable, rEnable;
String name; File path = null;
File fileName = null;
File library = null;
private String state;
private static final String dirName = "GameLibrary";
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.createfile);
setupVariables();
checkState(); //Locates the SD Card's path to create a new directory
//If the directory does not exist, then it is created
path = new File(Environment.getExternalStorageDirectory(), dirName);
if(!path.exists()){
path.mkdirs();
} //if you can read and write to storage
if (wEnable && rEnable) {
// Can Read and Write
confirm.setonclickListener(this);
// creates the library file
save.setonclickListener(this);
}
} private void setupVariables() {
confirm = (Button) findViewById(R.id.bConfirm);
save = (Button) findViewById(R.id.bSave);
tv = (EditText) findViewById(R.id.FileName); error = (TextView) findViewById(R.id.tvError);
state = Environment.getExternalStorageState();
wEnable = rEnable = false; } private void checkState() {
if (state.equals(Environment.MEDIA_MOUNTED)) {
// Can Read and Write to storage
wEnable = rEnable = true;
}
else{
Toast.makeText(this, "Cannot use External Storage", Toast.LENGTH_SHORT).show();
finish();
return;
}
} public void onclick(View v) {
switch (v.getId()) {
case R.id.bConfirm:
name = tv.getText().toString(); if (name.equals("")) {
error.setVisibility(View.VISIBLE);
}
else {
error.setVisibility(View.INVISIBLE);
save.setVisibility(View.VISIBLE);
}
break; case R.id.bSave:
name = tv.getText().toString() + ".txt";
library = new File(path, name); // MediaScannerConnection.scanFile(FileCreation.this, new String[]{library.toString()},
// null, new MediaScannerConnection.OnScanCompletedListener() {
// public void onScanCompleted(String path, Uri uri) {
// // TODO Auto-generated method stub
// runOnUiThread(new Runnable() {
// public void run() {
// Toast.makeText(FileCreation.this,
// "Media scan completed",
// Toast.LENGTH_SHORT).show();
// }
// });
// }
// });
// finish();
new SingleMediaScanner(FileCreation.this, library, new ScanListener(){
public void onScanFinish(){
finish();
Toast.makeText(FileCreation.this,
"Media scan completed",
Toast.LENGTH_SHORT).show();
}
});
break;
} } }