android实习程序
1\ .java
package zhao.android.day1;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
/*创建一个Activity 方法（界面）
创建一个类继承Activity
然后写oncreate 方法
在ANdroidManifest.xml文件中注册该activity
@Override为方法重写，注解的标记
获取TextView组件
获取Button组件
对Button组件添加时间监听
改变TextView组件中的Text值
*/
public class Android0701Activity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
//调用父类中的oncreate
super.onCreate(savedInstanceState);
//设置该activity的布局文件，静态的,去掉会出错
setContentView(R.layout.main);
//获取Button组件
Button button = (Button) findViewById(R.id.button);
//对Button组件添加时间监听
button.setOnClickListener(new MyClick());
/*
button.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
// TODO Auto-generated method stub
//获取TextView组件
TextView t = (TextView)findViewById(R.id.t);
//改变TextView组件中的Text值
t.setText("你好!");
}
});
*/
}
class MyClick implements OnClickListener{
public void onClick(View v) {
// TODO Auto-generated method stub
//获取TextView组件
TextView t = (TextView)findViewById(R.id.t);
//改变TextView组件中的Text值
t.setText("你好!");
}
}
}
2\main.xml
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
android:id="@+id/t"
/>
3.string.xml
4\ .manifest
package="zhao.android.day1"
android:versionCode="1"
android:versionName="1.0" >
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
android:name=".Android0701Activity"
android:label="@string/app_name" >
5\R.java
/* AUTO-GENERATED FILE. DO NOT MODIFY.
*
* This class was automatically generated by the
* aapt tool from the resource data it found. It
* should not be modified by hand.
*/
package zhao.android.day1;
public final class R {
public static final class attr {
}
public static final class drawable {
public static final int ic_launcher=0x7f020000;
}
public static final class id {
public static final int button=0x7f050001;
public static final int t=0x7f050000;
}
public static final class layout {
public static final int main=0x7f030000;
}
public static final class string {
public static final int app_name=0x7f040001;
public static final int click=0x7f040002;
public static final int hello=0x7f040000;
}
}
实现效果为简单点击按钮实现文本的改变
=====================================
1\ .java
package zhao.android.day1;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
/*
* 掌握
* 安卓的环境搭建
* 安卓项目中各个包的作用
* 安卓项目的运行过程
* 创建TextView Button Editview的组件及使用
* 按钮添加事件监听
*
*
*
* 作业：
* 获取各个组件
* 然后对按钮添加组件监听
* 获取输入的两个数值
* 计算乘积
* 显示结果在TextView中
*
* */
public class day01_2 extends Activity{
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main1);
Button button = (Button) findViewById(R.id.button);
button.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
// TODO Auto-generated method stub
EditText et1 =(EditText)findViewById(R.id.et1);
String str1 = et1.getText().toString();
EditText et2 =(EditText)findViewById(R.id.et2);
String str2 = et2.getText().toString();
int a1 = Integer.parseInt(str1);
int a2 = Integer.parseInt(str2);
int a3=a1*a2;
String str3 = String.valueOf( a3);
TextView t = (TextView)findViewById(R.id.t);
t.setText(str3);
}
});
}
}
2\main1.xml
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/et1"
/>
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="乘积"
/>
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/et2"
/>