Create debug message for logcat window:
Log.i("info","our message here");
“info” can be used as a filter in logcat, so choose a suitable name
Log.i(LOG_TAG, String.format("variable a: %d", a));
It is common use to set a LOG_TAG instead. Information can be build up with variables using String.format
Log.i(LOG_TAG, String.format("bCheck : %d", Boolean.compare(bCheck, false)));
Example shows how to show the content of a Boolean in logcat.
Create a user information dialog:
Toast.makeText(this, "our message", Toast.LENGTH_SHORT).show();
Threads:
Basic definition
new Thread(new Runnable() {
public void run() {
}
}).start();
Thread with parameters
(1) Implement class for thread runnable with parameters
public class myFunc implements Runnable{
private int Para1;
private float Para2;
public myFunc(int Para1, float Para2) {
this.Para1 = Para1;
this.Para2 = Para2;
}
public void run() {
// here you can use Para1 or Para2
}
}
(2) Use class for new thread
Runnable r=new myFunc(int Para1, float Para2);
Thread t = new Thread(r);
t.start();
File search user promp
This example shows how to set up an intent for audio search.
private static final int READ_REQUEST_CODE = 42;
@Override
public void onActivityResult(int requestCode, int resultCode, Intent resultData) {
if (requestCode == READ_REQUEST_CODE && resultCode == Activity.RESULT_OK) {
Uri uri=null;
if (resultData != null) {
uri =resultData.getData();
Log.i(LOG_TAG, "Uri: "+uri.toString());
}
}
}
public void performFileSearch() {
Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("audio/*");
startActivityForResult(intent.createChooser(intent,"Select Audio"), READ_REQUEST_CODE);
}
performFileSearch(); }