您好朋友我已经做了双指缩放TextView的和它的工作很好，但问题是，当我缩小了TextView的位置改变了，我想的TextView的位置，在变焦过程中是固定的和缩小这是我的code

 公共类MainActivity延伸活动{

    TextView的scaleGesture;
    ScaleGestureDetector scaleGestureDetector;

    @覆盖
    保护无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.activity_main）;
        scaleGesture =（TextView中）findViewById（R.id.article）;
        scaleGesture.setText（这是一些文本）;
        scaleGestureDetector =新ScaleGestureDetector（这一点，新simpleOnScaleGestureListener（））;
    }

    @覆盖
    公共布尔onCreateOptionsMenu（功能菜单）{
        //充气菜单;这增加了项目操作栏，如果它是present。
        。getMenuInflater（）膨胀（R.menu.activity_main，菜单）;
        返回true;
    }


    @覆盖
    公共布尔的onTouchEvent（MotionEvent事件）{
        // TODO自动生成方法存根
        scaleGestureDetector.onTouchEvent（事件）;
        返回true;
    }

    公共类simpleOnScaleGestureListener扩展
            SimpleOnScaleGestureListener {

        @覆盖
        公共布尔onScale（ScaleGestureDetector检测器）{
            // TODO自动生成方法存根
            浮大小= scaleGesture.getTextSize（）;
            Log.d（TextSizeStart，将String.valueOf（大小））;

            浮动系数= detector.getScaleFactor（）;
            Log.d（系数，将String.valueOf（因子））;


            浮产品=尺寸*因素;
            Log.d（TEXTSIZE，将String.valueOf（产品））;
            scaleGesture.setTextSize（TypedValue.COMPLEX_UNIT_PX，产品）;

            大小= scaleGesture.getTextSize（）;
            Log.d（TextSizeEnd，将String.valueOf（大小））;
            返回true;
        }
    }
}
 

解决方案

我已经做了这种方式：

activity_main.xml

 ＆LT; XML版本=1.0编码=UTF-8＆GT？;
＆LT; RelativeLayout的的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    机器人：layout_width =FILL_PARENT
    机器人：layout_height =FILL_PARENT
    机器人：方向=垂直＆GT;

    ＆LT;的TextView
        机器人：ID =@ + ID / MYTV
        机器人：layout_width =FILL_PARENT
        机器人：layout_height =WRAP_CONTENT
        机器人：layout_alignParentLeft =真
        机器人：layout_alignParentTop =真
        机器人：文本= /＆GT这是我的示例文本的双指缩放的演示，可以使用双指缩放，感谢放大和缩小;

＆LT; / RelativeLayout的＆GT;
 

MainActivity.java

 进口android.app.Activity;
进口android.os.Bundle;
进口android.view.MotionEvent;
进口android.view.View;
进口android.view.View.OnTouchListener;
进口android.widget.TextView;

公共类MyTextViewPinchZoomClass扩展活动实现OnTouchListener {

    最后静浮STEP = 200;
    TextView的MYTV;
    浮mRatio = 1.0F;
    INT mBaseDist;
    浮动mBaseRatio;
    浮字号= 13;

    公共无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.activity_main）;

        MYTV =（TextView中）findViewById（R.id.mytv）;
        mytv.setTextSize（mRatio + 13）;
    }

    公共布尔的onTouchEvent（MotionEvent事件）{
        如果（event.getPointerCount（）== 2）{
            INT行动= event.getAction（）;
            INT pureaction =动作和放大器; MotionEvent.ACTION_MASK;
            如果（pureaction == MotionEvent.ACTION_POINTER_DOWN）{
                mBaseDist = getDistance的（事件）;
                mBaseRatio = mRatio;
            } 其他 {
                浮动三角洲=（getDistance的（事件） -  mBaseDist）/步;
                浮动多=（浮点）Math.pow（2，三角洲）;
                mRatio = Math.min（1024.0f，Math.max（0.1F，mBaseRatio *多））;
                mytv.setTextSize（mRatio + 13）;
            }
        }
        返回true;
    }

    INT getDistance的（MotionEvent事件）{
        INT DX =（int）的（event.getX（0） -  event.getX（1））;
        INT DY =（int）的（event.getY（0） -  event.getY（1））;
        返程（INT）（的Math.sqrt（DX * DX + DY * DY））;
    }

    公共布尔onTouch（视图V，MotionEvent事件）{
        返回false;
    }
}
 

完成

Hello friend I have done pinch zoom textview and its work fine but the problem is when I zoom out the textview position changed and i want the position of textview is fixed during zoom in and zoom out that is my code

public class MainActivity extends Activity {

    TextView scaleGesture;
    ScaleGestureDetector scaleGestureDetector;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        scaleGesture = (TextView)findViewById(R.id.article);
        scaleGesture.setText("this is some text");
        scaleGestureDetector = new ScaleGestureDetector(this, new simpleOnScaleGestureListener());
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }


    @Override
    public boolean onTouchEvent(MotionEvent event) {
        // TODO Auto-generated method stub
        scaleGestureDetector.onTouchEvent(event);
        return true;
    }

    public class simpleOnScaleGestureListener extends
            SimpleOnScaleGestureListener {

        @Override
        public boolean onScale(ScaleGestureDetector detector) {
            // TODO Auto-generated method stub
            float size = scaleGesture.getTextSize();
            Log.d("TextSizeStart", String.valueOf(size));

            float factor = detector.getScaleFactor();
            Log.d("Factor", String.valueOf(factor));


            float product = size*factor;
            Log.d("TextSize", String.valueOf(product));
            scaleGesture.setTextSize(TypedValue.COMPLEX_UNIT_PX, product);

            size = scaleGesture.getTextSize();
            Log.d("TextSizeEnd", String.valueOf(size));
            return true;
        }
    }
}

I have done this way:

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/mytv"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:text="This is my sample text for pinch zoom demo, you can zoom in and out using pinch zoom, thanks" />

</RelativeLayout>

MainActivity.java:

import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.TextView;

public class MyTextViewPinchZoomClass extends Activity implements OnTouchListener {

    final static float STEP = 200;
    TextView mytv;
    float mRatio = 1.0f;
    int mBaseDist;
    float mBaseRatio;
    float fontsize = 13;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mytv = (TextView) findViewById(R.id.mytv);
        mytv.setTextSize(mRatio + 13);
    }

    public boolean onTouchEvent(MotionEvent event) {
        if (event.getPointerCount() == 2) {
            int action = event.getAction();
            int pureaction = action & MotionEvent.ACTION_MASK;
            if (pureaction == MotionEvent.ACTION_POINTER_DOWN) {
                mBaseDist = getDistance(event);
                mBaseRatio = mRatio;
            } else {
                float delta = (getDistance(event) - mBaseDist) / STEP;
                float multi = (float) Math.pow(2, delta);
                mRatio = Math.min(1024.0f, Math.max(0.1f, mBaseRatio * multi));
                mytv.setTextSize(mRatio + 13);
            }
        }
        return true;
    }

    int getDistance(MotionEvent event) {
        int dx = (int) (event.getX(0) - event.getX(1));
        int dy = (int) (event.getY(0) - event.getY(1));
        return (int) (Math.sqrt(dx * dx + dy * dy));
    }

    public boolean onTouch(View v, MotionEvent event) {
        return false;
    }
}

Done