图片的重绘_php重绘图片判断安全性问题

<RelativeLayout 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"
 >

    <ImageView
        android:id="@+id/imgView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:src="@drawable/icon" />

    <Button
        android:id="@+id/scale_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:text="Button" />

    <EditText
        android:id="@+id/scale_editView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_marginRight="20dp"
        android:onClick="direct_scale"
        android:text="direct_scale" />

</RelativeLayout>

import android.os.Bundle;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;

public class MainActivity extends Activity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // 加载Imageview和获得图片的信息
        final ImageView imageView = (ImageView) findViewById(R.id.imgView);
        final Bitmap bitmap = BitmapFactory.decodeResource(getResources(),
                R.drawable.icon);


        final Button scale_btn = (Button) findViewById(R.id.scale_btn);
        final EditText scale_text = (EditText) findViewById(R.id.scale_editView);
        scale_btn.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                String scaleStr = scale_text.getText().toString();
                if (scaleStr == null || "".equals(scaleStr))
                    return;
                float scale = 0.0f;
                try {
                    scale = Float.parseFloat(scaleStr);
                } catch (NumberFormatException e) {
                    return;
                }

                imageView.setImageBitmap(scaleBitmap(bitmap,scale));
            }
        });
    }

    public void direct_scale(View v)
    {

    }

    private Bitmap scaleBitmap(Bitmap bitmap ,float scale)
    {

        int bitmapWidth = bitmap.getWidth();
        int bitmapHeight = bitmap.getHeight();

        Matrix matrix = new Matrix();

        matrix.setScale(scale, scale);

        return  Bitmap.createBitmap(bitmap, 0, 0,
                bitmapWidth, bitmapHeight, matrix, true);
    }
}


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