Android应用程序开发期末大作业（2）
（3）用imageView和imagebutton及activity在界面上实现图片浏览
新建android项目如AI03，在项目的/AI03/src/com/example/ai03/MainActivity.java文件写下如下代码，注意包名和图片存放的位置！
图片存放目录位置为/AI03/res/drawable-hdpi
package com.example.ai03;
import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnLongClickListener;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.Toast;
public class MainActivity extends Activity {
//声明Image对象与ImageBoutton对象
private ImageView ivwPicture=null;
private ImageButton ibtnProv=null;
private ImageButton ibtnNext=null;
//声明5个图像
private Integer[] iImages = {R.drawable.a,R.drawable.b,R.drawable.c,R.drawable.d,R.drawable.e};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//获取ImageView对象ivwPicture
ivwPicture=(ImageView)super.findViewById(R.id.picture);
//获取两个按钮对象ImageButton
ibtnProv=(ImageButton)super.findViewById(R.id.prov);
ibtnNext=(ImageButton)super.findViewById(R.id.next);
//注册OnClick监听器
ibtnProv.setOnClickListener(new ProvOnClickListener());
ibtnNext.setOnClickListener(new NextOnClickListener());
//注册OnlongClick监听器
ivwPicture.setOnLongClickListener(new PicOnLongClick());
}
//单击“上一幅”按钮显示前一张图片
private class ProvOnClickListener implements OnClickListener{
private int i=5;
public void onClick(View view){
if(i > 0){
ivwPicture.setImageResource(iImages[--i]);
}
else if(i == 0){
i =5;
ivwPicture.setImageResource(iImages[4]);
}
}
}
//单击“下一幅”按钮显示后一张图片
private class NextOnClickListener implements OnClickListener{
private int i=0;
public void onClick(View view){
if(i < 5)
ivwPicture.setImageResource(iImages[i++]);
else if(i == 5){
i = 0;
ivwPicture.setImageResource(iImages[0]);
}
}
}
//长按图片设置为桌面墙纸
private class PicOnLongClick implements OnLongClickListener{
@Override
public boolean onLongClick(View view){
try{
//清空当前墙纸
MainActivity.this.clearWallpaper();
//当前view转换为ImageView对象
ImageView iv=(ImageView)view;
//启用图形缓冲
iv.setDrawingCacheEnabled(true);
//使用当前缓冲图形创建Bitmap
Bitmap bmp=Bitmap.createBitmap(iv.getDrawingCache());
//当前图形设置为墙纸
MainActivity.this.setWallpaper(bmp);
//清理图形缓冲
iv.setDrawingCacheEnabled(false);
Toast.makeText(getApplicationContext(), "背景设置成功！",Toast.LENGTH_LONG).show();
}
catch(Exception e){
Toast.makeText(getApplicationContext(), "背景设置失败！",Toast.LENGTH_LONG).show();
}
return true;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
转自：http://blog.csdn.net/jianghuiquan/article/details/8348680
（4）利用RadioButton、CheckBox、Activity等实现如图的功能及效果
新建android项目如AI04，在项目的/AI01/src/com/example/ai04/MainActivity.java文件写下如下代码，注意包名！
package com.example.ai04;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TextView;
public class MainActivity extends Activity {
RadioGroup rg;
TextView show;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//获取界面上rg、show两个组件
rg=(RadioGroup)findViewById(R.id.rg);
show=(TextView)findViewById(R.id.show);
//为RadioGroup组件的OnCheck事件绑定事件监听器
rg.setOnCheckedChangeListener(new OnCheckedChangeListener(){
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
//根据用户勾选的单选按钮来动态改变tip字符串的值
String tip=checkedId==R.id.male?"您的性别是男人":"您的性别是女人";
//修改show组件中的文本
show.setText(tip);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
转自：https://www.cnblogs.com/wolipengbo/p/3343443.html