ANDROID_MARS学习笔记_S01原始版_001_Intent

一、Intent简介

二、代码

1.activity_main.xml

 <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:paddingBottom="@dimen/activity_vertical_margin"
     android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     tools:context="com.example.s01_original_e05_intent.MainActivity" >

     <TextView
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="@string/hello_world" />

     <Button
         android:id="@+id/mBtn"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="@string/btnText"/>
 </RelativeLayout>

2.activity_ohter.xml

 <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:paddingBottom="@dimen/activity_vertical_margin"
     android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     tools:context="com.example.s01_original_e05_intent.OtherActivity" >

     <TextView
         android:id="@+id/otherView"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="这是另一个activity" />
 </RelativeLayout>

3.MainActivity.java

 package com.example.s01_original_e05_intent;

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

 public class MainActivity extends Activity {

     private Button mBtn = null;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         mBtn = (Button) findViewById(R.id.mBtn);
         mBtn.setOnClickListener(new btnListener());
     }

     public class btnListener implements OnClickListener {
         @Override
         public void onClick(View v) {
             /*Intent intent = new Intent();
             intent.putExtra("extraKey", "Extra中的值123");
             intent.setClass(MainActivity.this, OtherActivity.class);*/

             //intent也可以在不同项目的activity间传递数据，如跳转到发短信
             Uri uri = Uri.parse("smsto://10086");
             Intent intent = new Intent(Intent.ACTION_SENDTO, uri);
             intent.putExtra("sms_body", "我当前的话费余额是多少？");
             MainActivity.this.startActivity(intent);
         }

     }
 }

4.OtherActivity.java

 package com.example.s01_original_e05_intent;

 import android.app.Activity;
 import android.content.Intent;
 import android.os.Bundle;
 import android.widget.TextView;

 public class OtherActivity extends Activity {

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_ohter);
         Intent intent = getIntent();
         TextView otherView = (TextView) findViewById(R.id.otherView);
         otherView.setText(intent.getStringExtra("extraKey"));
     }
 }