<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" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"> <ImageButton android:id="@+id/imgbtn" android:contentDescription="@string/img_desc" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/bg_star_icon" /> //放在drawable資料夾底下的bg_start_icon.png,為一開始的預設圖(?) </RelativeLayout>
package com.lcpan.imagebutton;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageButton;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private ImageButton imgbtn;
private int click=0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imgbtn = (ImageButton)findViewById(R.id.imgbtn);
imgbtn.setOnClickListener(this);
}
public void onClick(View v) {
Bitmap img;
if(click%2==0)
img = BitmapFactory.decodeResource(getResources(), R.drawable.bg_moon_icon);
decodeResource(Resources res, int id)
Synonym for decodeResource(Resources, int, android.graphics.BitmapFactory.Options)
with null Options.
getResources()把所有R.java中的設定都抓出來,後面的int是用以抓特定對象的索引值
else img = BitmapFactory.decodeResource(getResources(), R.drawable.bg_star_icon); click++; imgbtn.setImageBitmap(img); //把從R.java中拿到的圖片放到按鈕上 } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.menu_main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } }
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