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restartPlayerBtn.setOnClickListener(new OnClickListener(){ @Override public void onClick(View view) { if(mediaPlayer!=null && !mediaPlayer.isPlaying()) { mediaPlayer.start(); mediaPlayer.seekTo(playbackPosition); } }}); } private void playAudio(String url)throws Exception { killMediaPlayer(); mediaPlayer = new MediaPlayer(); mediaPlayer.setDataSource(url); mediaPlayer.prepare(); mediaPlayer.start(); } @Override protected void onDestroy() { super.onDestroy(); killMediaPlayer(); } private void killMediaPlayer() { if(mediaPlayer!=null) { try { mediaPlayer.release(); } catch(Exception e) { e.printStackTrace(); } } } }

RadioGroup rdgrp = (RadioGroup)findViewById(R.id.rdGrp); RadioButton newRadioBtn = new RadioButton(this); newRadioBtn.setText("Pork"); rdgrp.addView(newRadioBtn);

Finally, once a user has checked a radio button within a radio group, the user cannot uncheck it by clicking it again. The only way to clear all radio buttons within a radio group is to call the clearCheck() method on the RadioGroup programmatically.

s Note State is all the information about what s going on with a given application. In normal desktop applications, such as a word processor, you know about text that is entered, mouse clicks, and so on. In a CGI application, you have only the data that is sent when the CGI is executed. After the CGI application finishes, it exits and is no longer running. Every time a CGI is called, it is as if it is starting for the first time, which can present interesting challenges for complex applications.

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The code in Listing 9-1 shows that the MainActivity class contains three members: a final string that points to the URL of the MP3 file, a MediaPlayer instance, and an integer member called playbackPosition You can see from the onCreate() method that the code wires up the click listeners for the three buttons In the button-click handler for the Start Playing Audio button, the playAudio() method is called In the playAudio() method, a new instance of the MediaPlayer is created and the data source of the player is set to the URL of the MP3 file The prepare() method of the player is then called to prepare the media player for playback, and then the start() method is called to start playback Now look at the button-click handlers for the Pause Player and Restart Player buttons.

The Android SDK offers several list controls. Figure 4 6 shows a ListView control that we ll discuss in this section.

The ListView control displays a list of items vertically. You generally use a ListView by writing a new activity that extends android.app.ListActivity. ListActivity contains a ListView, and you set the data for the ListView by calling the setListAdapter() method. For this exercise, we will fill the entire screen with the ListView so we don t even need to specify a ListView in our main layout XML file. But we do need to provide a layout for each row. Listing 4 17 demonstrates the layout file for our row, plus the Java code for our ListActivity.

This absence of state information is not an insurmountable problem. There are many ways of handling it, especially because most information is stored in a database. Statefulness is more a help for the programmer than a hindrance for the user.

Listing 4 17. Adding Items to a ListView < xml version="1.0" encoding="utf-8" > <!-- This file is at /res/layout/list_item.xml --> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="wrap_content" android:layout_height="wrap_content"> <CheckBox xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/row_chbox" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <TextView android:id="@+id/row_tv" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout>

You can see that when the Pause Player button is selected, you get the current position of the player by calling getCurrentPosition() You then pause the player by calling pause() When the player has to be restarted, you call start() and then call seekTo(), passing in the position obtained from getCurrentPosition() Realize that in this scenario you are playing an MP3 file from a web address Therefore, you will need to add androidpermissionINTERNET to your manifest file The MediaPlayer class also contains a stop() method Note that if you stop the player by calling stop(), you need to call prepare() before calling start() again Conversely, if you call pause(), you can call start() again without having to prepare the player Also, be sure to call the release() method of the media player once you are done using it.

public class ListDemoActivity extends ListActivity { private SimpleCursorAdapter adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Cursor c = getContentResolver().query(People.CONTENT_URI, null, null, null, null); startManagingCursor(c); String[] cols = new String[]{People.NAME}; int[] names = new int[]{R.id.row_tv}; adapter = new SimpleCursorAdapter(this,R.layout.list_item,c,cols,names); this.setListAdapter(adapter); } }

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