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"));
    }
}