tutorials/android-tutorial-2/src/org/freedesktop/gstreamer/tutorials/tutorial_2/Tutorial2.java

   1 package org.freedesktop.gstreamer.tutorials.tutorial_2;
   2
   3 import android.app.Activity;
   4 import android.os.Bundle;
   5 import android.util.Log;
   6 import android.view.View;
   7 import android.view.View.OnClickListener;
   8 import android.widget.ImageButton;
   9 import android.widget.TextView;
  10 import android.widget.Toast;
  11
  12 import org.freedesktop.gstreamer.GStreamer;
  13
  14 public class Tutorial2 extends Activity {
  15     private native void nativeInit();     // Initialize native code, build pipeline, etc
  16     private native void nativeFinalize(); // Destroy pipeline and shutdown native code
  17     private native void nativePlay();     // Set pipeline to PLAYING
  18     private native void nativePause();    // Set pipeline to PAUSED
  19     private static native boolean nativeClassInit(); // Initialize native class: cache Method IDs for callbacks
  20     private long native_custom_data;      // Native code will use this to keep private data
  21
  22     private boolean is_playing_desired;   // Whether the user asked to go to PLAYING
  23
  24     // Called when the activity is first created.
  25     @Override
  26     public void onCreate(Bundle savedInstanceState)
  27     {
  28         super.onCreate(savedInstanceState);
  29
  30         // Initialize GStreamer and warn if it fails
  31         try {
  32             GStreamer.init(this);
  33         } catch (Exception e) {
  34             Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
  35             finish();
  36             return;
  37         }
  38
  39         setContentView(R.layout.main);
  40
  41         ImageButton play = (ImageButton) this.findViewById(R.id.button_play);
  42         play.setOnClickListener(new OnClickListener() {
  43             public void onClick(View v) {
  44                 is_playing_desired = true;
  45                 nativePlay();
  46             }
  47         });
  48
  49         ImageButton pause = (ImageButton) this.findViewById(R.id.button_stop);
  50         pause.setOnClickListener(new OnClickListener() {
  51             public void onClick(View v) {
  52                 is_playing_desired = false;
  53                 nativePause();
  54             }
  55         });
  56
  57         if (savedInstanceState != null) {
  58             is_playing_desired = savedInstanceState.getBoolean("playing");
  59             Log.i ("GStreamer", "Activity created. Saved state is playing:" + is_playing_desired);
  60         } else {
  61             is_playing_desired = false;
  62             Log.i ("GStreamer", "Activity created. There is no saved state, playing: false");
  63         }
  64
  65         // Start with disabled buttons, until native code is initialized
  66         this.findViewById(R.id.button_play).setEnabled(false);
  67         this.findViewById(R.id.button_stop).setEnabled(false);
  68
  69         nativeInit();
  70     }
  71
  72     protected void onSaveInstanceState (Bundle outState) {
  73         Log.d ("GStreamer", "Saving state, playing:" + is_playing_desired);
  74         outState.putBoolean("playing", is_playing_desired);
  75     }
  76
  77     protected void onDestroy() {
  78         nativeFinalize();
  79         super.onDestroy();
  80     }
  81
  82     // Called from native code. This sets the content of the TextView from the UI thread.
  83     private void setMessage(final String message) {
  84         final TextView tv = (TextView) this.findViewById(R.id.textview_message);
  85         runOnUiThread (new Runnable() {
  86           public void run() {
  87             tv.setText(message);
  88           }
  89         });
  90     }
  91
  92     // Called from native code. Native code calls this once it has created its pipeline and
  93     // the main loop is running, so it is ready to accept commands.
  94     private void onGStreamerInitialized () {
  95         Log.i ("GStreamer", "Gst initialized. Restoring state, playing:" + is_playing_desired);
  96         // Restore previous playing state
  97         if (is_playing_desired) {
  98             nativePlay();
  99         } else {
 100             nativePause();
 101         }
 102
 103         // Re-enable buttons, now that GStreamer is initialized
 104         final Activity activity = this;
 105         runOnUiThread(new Runnable() {
 106             public void run() {
 107                 activity.findViewById(R.id.button_play).setEnabled(true);
 108                 activity.findViewById(R.id.button_stop).setEnabled(true);
 109             }
 110         });
 111     }
 112
 113     static {
 114         System.loadLibrary("gstreamer_android");
 115         System.loadLibrary("tutorial-2");
 116         nativeClassInit();
 117     }
 118
 119 }