OnScanCompletedListener崩溃,因为吐司
问题描述:
我写的SD卡在我的课,我可以成功地做到这一点,我还可以设置MediaScannerConnection,也是一个OnScanCompletedListener。这所有的作品,但是当我把举杯提醒扫描已经完成在OnScanCompleteListener用户,我只是得到了很多来自logcat的和敬酒不出现错误,但文件仍然保存到SD卡。OnScanCompletedListener崩溃,因为吐司
我怎样才能解决这个问题?
下面更详细..
写入SD卡(完美的作品)
InputStream is = getResources().openRawResource(R.drawable.greenball);
OutputStream os = new FileOutputStream(file);
byte[] data = new byte[is.available()];
is.read(data);
os.write(data);
is.close();
os.close();
的OnScanCompletedListener,只是不与里面的工作干杯?它仍然将文件保存在SD卡上,但我只是得到很多从logcat的和侧OnscanCompleteListener不会出现在敬酒的错误,我已经试过了没有面包和它的作品,所以它必须是。
MediaScannerConnection.scanFile(ExternalData.this,
new String[] {file.toString()},
null,
new MediaScannerConnection.OnScanCompletedListener() {
public void onScanCompleted(String path, Uri uri) {
// TODO Auto-generated method stub
Toast t = Toast.makeText(ExternalData.this, "scan complete", Toast.LENGTH_SHORT);
t.show();
}
});
一些日志猫错误
02-11 15:34:39.896: E/JavaBinder(11134): java.lang.RuntimeException: Can't create
handler inside thread that has not called Looper.prepare()
02-11 15:34:39.896: E/JavaBinder(11134): at android.os.Handler.<init>
(Handler.java:121)
02-11 15:34:39.896: E/JavaBinder(11134): at
android.widget.Toast.makeText(Toast.java:231)
任何帮助将是巨大的,我周围中搜索并真的不能找到这样的东西的。如果有一个简单的错误,我可以帮我解决一些问题吗,谢谢。
这里是我的这个类,以防万一它有助于全码:
IMPORTS...
public class ExternalData extends Activity implements OnClickListener,
OnItemSelectedListener {
TextView canWrite, canRead;
String state;
boolean canW, canR;
Spinner spinner;
String[] paths = { "Music", "Pictures", "Download" };
File path = null;
File file = null;
EditText saveFile;
Button confirm, save;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.externaldata);
canWrite = (TextView) findViewById(R.id.tvCanWrite);
canRead = (TextView) findViewById(R.id.tvCanRead);
confirm = (Button) findViewById(R.id.bConfirmSaveAs);
save = (Button) findViewById(R.id.bSaveFile);
saveFile = (EditText) findViewById(R.id.etSaveAs);
confirm.setOnClickListener(this);
save.setOnClickListener(this);
checkState();
ArrayAdapter<String> adapter = new ArrayAdapter<String>(ExternalData.this, android.R.layout.simple_spinner_item, paths);
spinner = (Spinner) findViewById(R.id.spinner1);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(this);
}
private void checkState() {
// TODO Auto-generated method stub
state = Environment.getExternalStorageState();
if (state.equals(Environment.MEDIA_MOUNTED)) {
// read and write
canWrite.setText("true");
canRead.setText("true");
canW = canR = true;
} else if (state.equals(Environment.MEDIA_MOUNTED_READ_ONLY)) {
// read but can't write
canWrite.setText("false");
canRead.setText("true");
canW = false;
canR = true;
} else {
canWrite.setText("false");
canRead.setText("false");
canW = canR = false;
}
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()){
case R.id.bSaveFile:
String f = saveFile.getText().toString();
file = new File(path, f + "png");
checkState();
if (canW == canR == true){
path.mkdir();
try {
InputStream is =
getResources().openRawResource(R.drawable.greenball);
OutputStream os = new FileOutputStream(file);
byte[] data = new byte[is.available()];
is.read(data);
os.write(data);
is.close();
os.close();
Toast t = Toast.makeText(ExternalData.this, "File has been Saved", Toast.LENGTH_LONG);
t.show();
//Update files for the user to use
MediaScannerConnection.scanFile(ExternalData.this,
new String[] {file.toString()},
null,
new MediaScannerConnection.OnScanCompletedListener() {
public void onScanCompleted(String path, Uri uri) {
// TODO Auto-generated method stub
Toast t = Toast.makeText(ExternalData.this, "Scan Complete", Toast.LENGTH_SHORT);
t.show();
}
});
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
break;
case R.id.bConfirmSaveAs:
save.setVisibility(View.VISIBLE);
break;
}
}
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// TODO Auto-generated method stub
int position = spinner.getSelectedItemPosition();
switch (position){
case 0:
path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC);
break;
case 1:
path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
break;
case 2:
path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
break;
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}
答
要调用makeToast在错误的线程。 尝试创建最终处理程序并发布您的makeToast。
final Handler handler = new Handler();
MediaScannerConnection.scanFile.....
handler.post(new Runable()...
我不知道这是什么意思完全因为我很新到Android,但我已经解决了这个问题,我所做的是由土司变量的全局,只是在上创建初始化他们一次方法,然后OnScanCompleteListener只需显示吐司。你认为这是一个好的解决办法吗? – 2012-02-11 16:31:54