**アンドロイド**でレイアウトやテキストビューのテキストサイズを拡大してズームイン/ズームアウトする方法は？

Question

ここには蛇口のコードがあり、アンドロイドのズームイン/アウトボタンフォームを使用してズームイン/アウト機能を作りたいと思っています。

public class ShowDescription extends Activity{ 
@Override 
public void onCreate(Bundle savedInstanceState){ 
    new LoadDetails(this).execute(); 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.showdescription); 
    String theStory = null; 
    String pubDate = null; 
    String storyTitle = null; 
    String writer = null; 
    //String test = null; 

    Intent intent = getIntent(); 

    if (intent != null) { 
     Bundle b = intent.getExtras(); 
     if (b == null) { 
      theStory = "bad bundle?"; 
     } else { 
      storyTitle =ComplexScript.UTF2ANSI(ComplexScript.swap(b.getString("title")))+"\n\n"; 
      //pubDate=ComplexScript.UTF2ANSI(ComplexScript.swap(ComplexScript.Replace(b.getString("pubdate"))))+ "\n\n"; 
      pubDate=ComplexScript.Replace(b.getString("pubdate"))+"\n"; 
      writer=ComplexScript.UTF2ANSI(ComplexScript.swap(b.getString("writers")))+",\n"+ComplexScript.UTF2ANSI(ComplexScript.swap(b.getString("initial")))+"\n"; 
      theStory =ComplexScript.UTF2ANSI(ComplexScript.swap(b.getString("description"))).replace('\n', ' ').replaceAll(" "," ").replaceAll("‘","Ô").replaceAll("’","Õ"); 
        //+ "\n\nMore information:\n" + b.getString("link"); 
      //test=b.getString("image"); 
     } 
    } else { 
     theStory = "Information not found."; 
    } 
    //Bitmap bimage= getBitmapFromURL(test); 
    //iv.setImageBitmap(bimage); 
    Typeface tf = Typeface.createFromAsset(getAssets(), 
       "font/SutonnyMJ.ttf"); 
    TextView story = (TextView)findViewById(R.id.storybox); 
    story.setText(Html.fromHtml("<h1><font color='#B10000'>"+storyTitle+"</font></h1><small>"+pubDate+"<br/>"+writer+"</small><p>"+theStory+"</p>")); 
    story.setTypeface(tf); 
    story.setLineSpacing(1,(float) 1.5); 
    TextView moto =(TextView)findViewById(R.id.moto); 
    moto.setText("msev` we‡bv`b mviv¶Y"); 
    moto.setTypeface(tf); 
    Button backButton = (Button)findViewById(R.id.back); 
    backButton.setTypeface(tf); 
    TextView tv = (TextView) findViewById(R.id.footer); 
    tv.setTypeface(tf); 
    backButton.setOnClickListener(new Button.OnClickListener(){ 
     public void onClick(View v) { 
      finish(); 
     } 
    }); 
}} 

そして、ここでは以下のいずれかのズームを作成し、このクラスを乳房施設をズームアウトすることができXMLファイル

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#FFF" android:orientation="vertical"> 
<ImageView android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:background="#86878A" 
      android:contentDescription="@string/app_name" 
      android:src="@drawable/logobn24"/> 

<TextView android:id="@+id/moto" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:background="#86878A" 
      android:textColor="#FFF" 
      android:gravity="center"/> 

<TextView android:id="@+id/title" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:background="#86878A"/> 

    <ScrollView android:id="@+id/scrollView1" 
       android:layout_width="match_parent" 
       android:layout_height="0dip" 
       android:layout_weight="1">  

     <RelativeLayout 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:background="#FFF" 
      android:orientation="vertical" > 

       <!-- android:textColor="#4e4e4e" --> 
      <ImageView android:id="@+id/img" 
         android:layout_width="150dp" 
         android:layout_height="100dp" 
         android:layout_alignParentTop="true" 
         android:layout_centerHorizontal="true" 
         android:contentDescription="@string/des"/> 

      <TextView android:id="@+id/storybox" 
         android:layout_width="fill_parent" 
         android:layout_height="wrap_content" 
         android:layout_alignParentLeft="true" 
         android:layout_below="@+id/img" 
         android:background="#FFFFFF" 
         android:paddingLeft="10dp" 
         android:textColor="#000" 
         android:textSize="18dp" 
         android:paddingTop="10dp"/> 

     </RelativeLayout> 
    </ScrollView> 

<Button android:id="@+id/back" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/back"/> 

<TextView android:id="@+id/footer" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:background="#86878A" 
      android:gravity="center_vertical|center_horizontal" 
      android:text="@string/footer" 
      android:textColor="#FFF" android:lineSpacingMultiplier="1.3"/> 

のですか？ Text Viewのテキストサイズを増減するstory？ 誰でも助けてくれますか？

Answer 1

TextViewのメソッドを呼び出すとどうなりますか？

public void setScaleX(float scaleX) 
public void setScaleY(float scaleY) 

Answer 2

これは

import android.content.Context; 
import android.graphics.Canvas; 
import android.util.AttributeSet; 
import android.view.MotionEvent; 
import android.view.ScaleGestureDetector; 
import android.widget.TextView; 

public class ResizableTextViewW extends TextView { 
private static final int INVALID_POINTER_ID = -1; 

public static final String TAG = ResizableTextViewW.class.getSimpleName(); 

private float mLastTouchX; 
private float mLastTouchY; 
private int mActivePointerId = INVALID_POINTER_ID; 

private ScaleGestureDetector mScaleDetector; 
private float mScaleFactor = 1.f; 
private int count = 0; 
public float mPreviousScaleFactor = 1.f; 

public ResizableTextViewW(Context context) { 
    this(context, null, 0); 

} 

public ResizableTextViewW(Context context, AttributeSet attrs) { 
    this(context, attrs, 0); 
} 

public ResizableTextViewW(Context context, AttributeSet attrs, int defStyle) { 
    super(context, attrs, defStyle); 
    mScaleDetector = new ScaleGestureDetector(context, new ScaleListener()); 

} 

@Override 
public boolean onTouchEvent(MotionEvent ev) { 
    // Let the ScaleGestureDetector inspect all events. 
    mScaleDetector.onTouchEvent(ev); 
    return true; 
} 

@Override 
public void onDraw(Canvas canvas) { 
    super.onDraw(canvas); 


    this.setText(String.valueOf(count)); 
    this.setTextSize(10+count); 

} 

private class ScaleListener extends 
     ScaleGestureDetector.SimpleOnScaleGestureListener { 
    @Override 
    public boolean onScale(ScaleGestureDetector detector) { 
     mScaleFactor *= detector.getScaleFactor(); 
     // Don't let the object get too small or too large. 
     mScaleFactor = Math.max(0.1f, Math.min(mScaleFactor, 5.0f)); 

     if (mScaleFactor > mPreviousScaleFactor) { 
      count = count + 1; 
      invalidate(); 

     } else if (mScaleFactor < mPreviousScaleFactor) { 
      if (count > 0) { 
       count = count - 1; 
       invalidate(); 
      } 
     } 
     mPreviousScaleFactor = mScaleFactor; 
     return true; 
    } 
}