Get installed TTS engines, by calling getEngines() method.

Start from Android API level 14, List<TextToSpeech.EngineInfo> getEngines() method was provided to get a list of all installed TTS engines.

To display installed TTS Engines:

package com.example.androidtexttospeech;

import java.util.ArrayList;
import java.util.List;

import android.os.Bundle;
import android.speech.tts.TextToSpeech;
import android.speech.tts.TextToSpeech.OnInitListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;
import android.app.Activity;

public class MainActivity extends Activity implements OnInitListener{
 
 TextView tvDefaultTTS;
 
 Spinner spInstalledEngines;
 TextToSpeech tts;
 List<TextToSpeech.EngineInfo> listInstalledEngines;
 List<String> listInstalledEnginesName;
 String defaultTTS;
 
 private ArrayAdapter<String> adapter;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  tvDefaultTTS = (TextView)findViewById(R.id.defaulttts);
  spInstalledEngines = (Spinner)findViewById(R.id.installedengines);

  tts = new TextToSpeech(this, this);
  listInstalledEngines = tts.getEngines();
  listInstalledEnginesName = new ArrayList<String>();

        for(int i = 0; i < listInstalledEngines.size(); i++){
         listInstalledEnginesName.add(listInstalledEngines.get(i).label);
        }
        
        adapter = new ArrayAdapter<String>(
    this, android.R.layout.simple_spinner_item, listInstalledEnginesName);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spInstalledEngines.setAdapter(adapter);
  
        defaultTTS = tts.getDefaultEngine();
        tvDefaultTTS.setText("Default TTS Engine: " + defaultTTS);
 }

 @Override
 public void onInit(int status) {
  // TODO Auto-generated method stub
  
 }

 @Override
 protected void onDestroy() {
  // TODO Auto-generated method stub
  super.onDestroy();
  tts.shutdown();
 }

}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="@string/hello_world" />
    <TextView
        android:id="@+id/defaulttts"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>
    <Spinner 
        android:id="@+id/installedengines"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>

Next:
- Get features supported by TextToSpeech Engine

Get device's Android ID

Secure.ANDROID_ID is a 64-bit number (as a hex string) that is randomly generated on the device's first boot and should remain constant for the lifetime of the device. (The value may change if a factory reset is performed on the device.)

package com.example.androidid;

import android.os.Bundle;
import android.provider.Settings.Secure;
import android.app.Activity;
import android.widget.Toast;

public class MainActivity extends Activity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  String id = Secure.getString(getContentResolver(), Secure.ANDROID_ID);
  Toast.makeText(getApplicationContext(), id, Toast.LENGTH_LONG).show();
 }

}

Lập trình android

Lập trình android

Read raw text file, and display in ScrollView.

This article demonstrate how to read raw text file from /res/raw/ folder, and display the text in a TextView inside ScrollView.

Create raw text file at /res/raw/mytext.txt.

Santa Claus Is Coming To Town:

You better watch out
You better not cry
Better not pout
I'm telling you why
Santa Claus is coming to town

He's making a list,
And checking it twice;
Gonna find out Who's naughty and nice.
Santa Claus is coming to town

He sees you when you're sleeping
He knows when you're awake
He knows if you've been bad or good
So be good for goodness sake!

O! You better watch out!
You better not cry.
Better not pout, I'm telling you why.
Santa Claus is coming to town.
Santa Claus is coming to town.

Add a ScrollView with TextView inside, to our layout.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" 
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <ScrollView 
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <TextView
            android:id="@+id/mytextview"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </ScrollView>
    
</LinearLayout>

Main code:

package com.AndroidTextResource;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends Activity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  TextView myTextView = (TextView)findViewById(R.id.mytextview);
  
  InputStream inputStream = getResources().openRawResource(R.raw.mytext);
  ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
  
  String myText = "";
  int in;
  try {
   in = inputStream.read();
   while (in != -1)
   {
    byteArrayOutputStream.write(in);
    in = inputStream.read(); 
   }
   inputStream.close();
   
   myText = byteArrayOutputStream.toString(); 
  }catch (IOException e) {
   e.printStackTrace(); 
  }

  myTextView.setText(myText); 
 }
 
}

Draw path on SurfaceView's canvas

Example to detect touch events and draw path on SurfaceView's canvas accordingly.

package com.TestSurefaceView;

import java.util.Random;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

 public class MainActivity extends Activity {
  
  MySurfaceView mySurfaceView;
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   mySurfaceView = new MySurfaceView(this);
   setContentView(mySurfaceView); 
  }
  
  class MySurfaceView extends SurfaceView{

   Path path;
   
   Thread thread = null;
   SurfaceHolder surfaceHolder;
   volatile boolean running = false;
   
   private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
   Random random;
   
   public MySurfaceView(Context context) {
    super(context);
    surfaceHolder = getHolder();
    paint.setStyle(Paint.Style.STROKE);
    paint.setStrokeWidth(3);
    paint.setColor(Color.WHITE);
   }

   @Override
   public boolean onTouchEvent(MotionEvent event) {
    if(event.getAction() == MotionEvent.ACTION_DOWN){
     path = new Path();
     path.moveTo(event.getX(), event.getY());
    }else if(event.getAction() == MotionEvent.ACTION_MOVE){
     path.lineTo(event.getX(), event.getY());
    }else if(event.getAction() == MotionEvent.ACTION_UP){
     path.lineTo(event.getX(), event.getY());
    }
    
    if(path != null){
     Canvas canvas = surfaceHolder.lockCanvas();
     canvas.drawPath(path, paint);
     surfaceHolder.unlockCanvasAndPost(canvas);
    }

    return true; 
   }
  }
}

Related Post:
- Detect multi-touch, on SurfaceView

Capture screen with getDrawingCache() repeatly

In the article "Create custom dialog with dynamic content, updated in onPrepareDialog()", it demonstrate how to capture screen with setDrawingCacheEnabled() and getDrawingCache() methods. Unfortunately, it cannot work as expected! The screen is captured in the first time only. After that, every time call getDrawingCache() return the same first screen.

To solve it call setDrawingCacheEnabled(false) and then setDrawingCacheEnabled(true) to re-load the cache bitmap.

Modify onClick() method of btnCaptureScreen's OnClickListener:

     btnCaptureScreen.setOnClickListener(new OnClickListener(){
      
      @Override
      public void onClick(View arg0) {
       screen.setDrawingCacheEnabled(false);
       screen.setDrawingCacheEnabled(true);
       bmScreen = screen.getDrawingCache();
       showDialog(ID_SCREENDIALOG);
      }});