痞客興的部落格

package com.example.charleslin.carresize;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RadioButton;
import android.widget.RadioGroup;


public class MainActivity extends ActionBarActivity {

   ImageView iv;
   RadioButton rb1,rb2,rb3;
   RadioGroup rg;
   Bitmapbm;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       LinearLayout ll = new LinearLayout(this);
       ll.setOrientation(LinearLayout.VERTICAL);
       setContentView(ll);

       rb1 = new RadioButton(this);
       rb2 = new RadioButton(this);
       rb3 = new RadioButton(this);

       rb1.setText("small");
       rb2.setText("normal");
       rb3.setText("large");

       rg = new RadioGroup(this);
       rg.addView(rb1);
       rg.addView(rb2);
       rg.addView(rb3);

       rb2.setChecked(true);

       bm = BitmapFactory.decodeResource(getResources(),R.drawable.tiger); //記得在res裡的drawable目錄裡放入tiger.jpg
       iv = new ImageView(this);
       iv.setImageBitmap(bm);

       ll.addView(rg);
       ll.addView(iv);

       rb1.setOnClickListener(new rbClickListener());
       rb2.setOnClickListener(new rbClickListener());
       rb3.setOnClickListener(new rbClickListener());
   }

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

   @Override
   public boolean onOptionsItemSelected(MenuItem item) {
       // Handle action bar item clicks here. The action bar will
       // automatically handle clicks on the Home/Up button, so long
       // as you specify a parent activity in AndroidManifest.xml.
       int id = item.getItemId();

       //noinspection SimplifiableIfStatement
       if (id == R.id.action_settings) {
           return true;
       }

       return super.onOptionsItemSelected(item);
   }

   private class rbClickListener implements View.OnClickListener {
       @Override
       public void onClick(View v) {
           Matrix m = new Matrix();
           if(v == rb1) m.postScale(0.5F,0.5F);
           if(v == rb2) m.postScale(1,1);
           if(v == rb3) m.postScale(2,2);

           Bitmap bm2 = Bitmap.createBitmap(bm,0,0,bm.getWidth(),bm.getHeight(),m,true);
           iv.setImageBitmap(bm2);
       }
   }
}