Android初级教程

来源：互联网发布：软件性能测试视频教程编辑：程序博客网时间：2024/06/05 13:23

因为我是在写监听网络的时候，不经意想起多级Activity是否可以数据传递（当然再此之前我一般都只是进行A-B的数据传递），因是临时想起，所以包名，XMl名，VIew id并不是很规范。

执行流程：

这里写图片描述

运行结果：

这里写图片描述

注意：

Activity注册

<activity android:name=".SecoundActivity"/><activity android:name=".ThirdActivity"/>

代码中的NetState不用处理
Xml中的隐藏View不用处理

MainActivity :

package com.example.dow.receiverdemo;import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.TextView;public class MainActivity extends AppCompatActivity {    private TextView mState;    private TextView mBtn;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);//        mState = (TextView) findViewById(R.id.net_state);        mBtn = (TextView) findViewById(R.id.mBtn_first);        mBtn.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Intent intent=new Intent(MainActivity.this,SecoundActivity.class);                Bundle bundle = new Bundle();                bundle.putString("data","First数据传递");                intent.putExtras(bundle);                Log.e("tag","被点击");                startActivity(intent);            }        });    }}

SecoundActivity :

package com.example.dow.receiverdemo;import android.content.Intent;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.View;import android.widget.TextView;/** * Created by YongLiu on 2017/5/24. */public class SecoundActivity extends AppCompatActivity {    private TextView mBtn;    private String data;    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_secound);        Intent intent = getIntent();        Bundle bundle = intent.getExtras();        data = (String) bundle.get("data");        Log.e("tag","MainFirst传输过来的数据===="+ data);        mBtn = (TextView) findViewById(R.id.mBtn_secound);        mBtn.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Intent intent=new Intent(SecoundActivity.this,ThirdActivity.class);                Bundle bundle = new Bundle();                bundle.putString("data",data);                intent.putExtras(bundle);                startActivity(intent);            }        });    } }

ThirdActivity ：

package com.example.dow.receiverdemo;import android.content.Intent;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v7.app.AppCompatActivity;import android.util.Log;/** * Created by YongLiu on 2017/5/25. */public class ThirdActivity extends AppCompatActivity {    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_third);        Intent intent = getIntent();        Bundle bundle = intent.getExtras();        String data = (String) bundle.get("data");        Log.e("tag","Secound传输过来的数据===="+data);    }}

MainActivity Xml :

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="com.example.dow.receiverdemo.MainActivity">    <TextView        android:layout_width="match_parent"        android:gravity="center"        android:padding="5dp"        android:id="@+id/net_state"        android:visibility="gone"        android:layout_height="wrap_content"        android:text="隐藏的网络状态" />    <TextView        android:layout_width="match_parent"        android:gravity="center"        android:padding="5dp"        android:id="@+id/mBtn_first"        android:layout_height="wrap_content"        android:text="事件多级传递" /></LinearLayout>

SecoundActivity Xml :

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"   >    <TextView        android:layout_width="match_parent"        android:gravity="center"        android:padding="5dp"        android:id="@+id/net_state_secound"        android:visibility="gone"        android:layout_height="wrap_content"        android:text="隐藏的网络状态" />    <TextView        android:layout_width="match_parent"        android:gravity="center"        android:padding="5dp"        android:id="@+id/mBtn_secound"        android:layout_height="wrap_content"        android:text="Secound事件多级传递" /></LinearLayout>

ThirdActivity Xml ：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    >    <TextView        android:layout_width="match_parent"        android:gravity="center"        android:padding="5dp"        android:id="@+id/net_state_three"        android:visibility="gone"        android:layout_height="wrap_content"        android:text="隐藏的网络状态" />    <TextView        android:layout_width="match_parent"        android:gravity="center"        android:padding="5dp"        android:id="@+id/mBtn_three"        android:layout_height="wrap_content"        android:text="Third事件多级传递" /></LinearLayout>

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