Andorid入门（Activity和Intent入门）代码

来源：互联网发布：怎么删除旧版windows 编辑：程序博客网时间：2024/06/07 05:16

1.第一个activity

package com.test.activity;

import com.example.activityfirst.R;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.Toast;

public class ActivityFirst extends Activity{

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//不显示title
requestWindowFeature(Window.FEATURE_NO_TITLE);
//设置布局
setContentView(R.layout.first_layout);
//取得当前页面的button
Button button1=(Button)findViewById(R.id.button_1);
Button button2=(Button)findViewById(R.id.button_2);
//实例化一个OnClickListener
OnClickListener on =new OnClickListener() {
@Override
public void onClick(View v) {
//在活动中生成toast，相当于alert
Toast.makeText(ActivityFirst.this, "haha", Toast.LENGTH_SHORT).show();
}
};
//设置监听
//button1.setOnClickListener(on);
//为button设置退出的监听，销毁当前活动
button1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
/*
* 隐式intent的基本使用
* Intent intent =new Intent("ACTION_START");
intent.addCategory("addCategory");
startActivity(intent);*/

/*
* 隐式intent的打开网页
* Intent intent=new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse("http://www.baidu.com"));
startActivity(intent);*/
/**
* 隐式intent的传值
*/
String date="haha,ok";
Intent intent =new Intent("ACTION_START");
intent.addCategory("addCategory");
intent.putExtra("extra_date", date);
//startActivity(intent);
//启动intent，返回并希望有返回值
startActivityForResult(intent, 1);
}
});

//button2显示Intent启动ActivitySecond
button2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent =new Intent(ActivityFirst.this, ActivitySecond.class);
startActivity(intent);
}
});
}

/**
* 重写onCreateOptionsMenu方法，在该activity里生产menu
*/
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

/**
* 为此menu的按钮设置响应
*/
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.add_item:
Toast.makeText(this, "6666", Toast.LENGTH_SHORT).show();
break;
case R.id.remove_item:
Toast.makeText(this, "7777", Toast.LENGTH_SHORT).show();
break;
default:
break;
}
return true;
}
/***
* 再次返回改页面是，返回的值
*/

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (resultCode) {
case 1:
if(resultCode == RESULT_OK){
String back_extra=data.getStringExtra("back_extra");
Toast.makeText(this, back_extra, Toast.LENGTH_SHORT);
}
break;
default:
break;
}
}

}
2.调转到的activity

package com.test.activity;
import com.example.activityfirst.R;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.Toast;

public class ActivitySecond extends Activity{

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.second_layout);
//隐式intent的取值
Intent in=getIntent();
String date=in.getStringExtra("extra_date");
Toast.makeText(this, date,Toast.LENGTH_SHORT).show();
Button bu=(Button) findViewById(R.id.button_3);
bu.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//返回intent
Intent intentback=new Intent();
intentback.putExtra("back_extra", "banckActivi");
setResult(RESULT_OK, intentback);
finish();
}
});
}

//返回按钮的返回设置
@Override
public void onBackPressed() {
Intent intentback=new Intent();
intentback.putExtra("back_extra", "banckActivi");
setResult(RESULT_OK, intentback);
finish();
}
}

3.第一个activity对应的页面xml（第二个类似）

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<Button
android:id="@+id/button_1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="隐intent"
/>

<Button
android:id="@+id/button_2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="显intent"
/>
</LinearLayout>

4.为activity1设置menu页面（调用menu的方法在activity1里已有，也就是重写onOptionsItemSelected方法）

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
<item
android:id="@+id/add_item"
android:title="add"
/>
<item
android:id="@+id/remove_item"
android:title="remove"
/>
</menu>
5.manifest配置文件（声明activity）

----------------------------------------------------------------------------第一个Android的代码---------------------------------------------------------------------------------------

说明：

Toast.makeText(ActivityFirst.this, "haha", Toast.LENGTH_SHORT).show(); 类似java里的alert

requestWindowFeature(Window.FEATURE_NO_TITLE);当前页面不显示title

Android里的传值-----

String date="haha,ok";
Intent intent =new Intent("ACTION_START");//隐式跳转的activity，配置文件配置
intent.addCategory("addCategory");//指定当前动作（Action）被执行的环境，配置文件配置
intent.putExtra("extra_date", date);//要传的值
//startActivity(intent);
startActivityForResult(intent, 1);//启动intent，返回并希望有返回值

Android的menu设置----

Android返回------

0 0