让您的应用程序响应用户_Java_下载.zip

package com.stylingandroid.background; import java.net.MalformedURLException; import java.net.URL; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.os.Bundle; import android.support.v4.app.FragmentActivity; import android.support.v4.app.LoaderManager; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.Loader; import android.view.View; import android.widget.Button; import android.widget.ProgressBar; import android.widget.Toast; public class MainActivity extends FragmentActivity implements LoaderCallbacks<String> { private ProgressBar loaderProgress; private Button loaderButton; private ProgressBar serviceProgress; private Button serviceButton; private MyServiceReceiver receiver = new MyServiceReceiver(); /** Called when the activity is first created. */ @Override public void onCreate( Bundle savedInstanceState ) { super.onCreate( savedInstanceState ); setContentView( R.layout.main ); loaderProgress = (ProgressBar) findViewById( R.id.loaderProgress ); loaderButton = (Button) findViewById( R.id.loaderButton ); serviceProgress = (ProgressBar) findViewById( R.id.serviceProgress ); serviceButton = (Button) findViewById( R.id.serviceButton ); } /* * AsyncTask */ public void doAsyncTask( View v ) throws MalformedURLException { MyAsyncTask task = new MyAsyncTask( this ); URL url = new URL( "http://www.google.com" ); task.execute( url, url, url, url ); } /* * Loader */ public void doLoader( View v ) { LoaderManager lm = getSupportLoaderManager(); Loader<String> loader = lm.restartLoader( 0, null, this ); loaderProgress.setVisibility( View.VISIBLE ); loaderButton.setVisibility( View.INVISIBLE ); loader.forceLoad(); } @Override public Loader<String> onCreateLoader( int id, Bundle args ) { return new MyLoader( this ); } @Override public void onLoadFinished( Loader<String> loader, String str ) { loaderProgress.setVisibility( View.INVISIBLE ); loaderButton.setVisibility( View.VISIBLE ); Toast.makeText( this, str, Toast.LENGTH_SHORT ).show(); } @Override public void onLoaderReset( Loader<String> loader ) { } /* * Service */ public void doService( View v ) { serviceProgress.setVisibility( View.VISIBLE ); serviceButton.setVisibility( View.INVISIBLE ); startService( new Intent( MyService.ACTION_DO_SOMETHING ) ); } @Override protected void onStart() { super.onStart(); IntentFilter filter = new IntentFilter(); filter.addAction( MyService.ACTION_UPDATE ); filter.addAction( MyService.ACTION_PROGRESS ); registerReceiver( receiver, filter ); } @Override protected void onStop() { unregisterReceiver( receiver ); super.onStop(); } private class MyServiceReceiver extends BroadcastReceiver { @Override public void onReceive( Context context, Intent intent ) { if ( intent.getAction().equals( MyService.ACTION_PROGRESS ) ) { int progress = intent.getIntExtra( MyService.EXTRA_PROGRESS, 0 ); int max = intent.getIntExtra( MyService.EXTRA_MAX, 0 ); serviceProgress.setMax( max ); serviceProgress.setProgress( progress ); } if ( intent.getAction().equals( MyService.ACTION_UPDATE ) ) { String text = intent .getStringExtra( MyService.EXTRA_UPDATE_TEXT ); serviceProgress.setVisibility( View.INVISIBLE ); serviceButton.setVisibility( View.VISIBLE ); Toast.makeText( MainActivity.this, text, Toast.LENGTH_SHORT ) .show(); } } } }