实验目的：
熟悉和掌握Android组件间通信的方式和技巧。
实验要求：
1. 运行课本的示例程序，理解组件通信的方式和过程
2.设计一个主Activity和一个子Activity（Sub-Activity），使用主Activity上的按钮启动子Activity，并将子Activity的一些信息返回给主Activity，并显示在主Activity上。
1 package com.flyuz.myapplication; 2 3 import android.content.Intent; 4 import android.net.Uri; 5 import android.support.v7.app.AppCompatActivity; 6 import android.os.Bundle; 7 import android.view.View; 8 import android.widget.Button; 9 import android.widget.TextView;10 11 public class MainActivity extends AppCompatActivity {12 Button bt1;13 Button bt2;14 TextView tv;15 final int SUBACTIVITY1 = 1;16 final int SUBACTIVITY2 = 2;17 @Override18 protected void onCreate(Bundle savedInstanceState) {19 super.onCreate(savedInstanceState);20 setContentView(R.layout.activity_main);21 setTitle("MainActivity");22 bt1 = (Button) findViewById(R.id.bt1);23 bt2 = (Button) findViewById(R.id.bt2);24 tv = (TextView) findViewById(R.id.tv);25 bt1.setOnClickListener(new View.OnClickListener() {26 @Override27 public void onClick(View view) {28 Intent intent = new Intent(MainActivity.this, NewActivity1.class);29 startActivityForResult(intent, SUBACTIVITY1);30 }31 });32 bt2.setOnClickListener(new View.OnClickListener() {33 @Override34 public void onClick(View view) {35 Intent intent = new Intent(MainActivity.this, NewActivity2.class);36 startActivityForResult(intent, SUBACTIVITY2);37 }38 });39 }40 41 protected void onActivityResult(int requestCode, int resultCode, Intent data) {42 super.onActivityResult(requestCode, resultCode, data);43 switch (requestCode) {44 case SUBACTIVITY1:45 if (resultCode == 1) {46 Uri uriData = data.getData();47 tv.setText(uriData.toString());48 }49 case SUBACTIVITY2:50 if (resultCode == -1) {51 Uri uriData = data.getData();52 tv.setText(uriData.toString());53 }54 }55 }56 }
MainActivity
1 package com.flyuz.myapplication; 2 3 import android.net.Uri; 4 import android.support.v7.app.AppCompatActivity; 5 import android.os.Bundle; 6 import android.view.View; 7 import android.widget.Button; 8 import android.widget.EditText; 9 import android.content.Intent;10 11 public class NewActivity1 extends AppCompatActivity {12 Button btOk;13 EditText et;14 @Override15 protected void onCreate(Bundle savedInstanceState) {16 super.onCreate(savedInstanceState);17 setContentView(R.layout.activity_new1);18 setTitle("NewActivity1");19 btOk = (Button)findViewById(R.id.btOK);20 et = (EditText)findViewById(R.id.et);21 btOk.setOnClickListener(new View.OnClickListener() {22 @Override23 public void onClick(View view) {24 String str = et.getText().toString();25 Uri data = Uri.parse("来自NewActivity1的消息" + str);26 Intent result = new Intent(null, data);27 setResult(1, result);28 finish();29 }30 });31 }32 }
NewActivity1
1 package com.flyuz.myapplication; 2 3 import android.net.Uri; 4 import android.support.v7.app.AppCompatActivity; 5 import android.os.Bundle; 6 import android.view.View; 7 import android.widget.Button; 8 import android.widget.EditText; 9 import android.content.Intent;10 11 public class NewActivity2 extends AppCompatActivity {12 Button btOk;13 EditText et;14 @Override15 protected void onCreate(Bundle savedInstanceState) {16 super.onCreate(savedInstanceState);17 setContentView(R.layout.activity_new1);18 setTitle("NewActivity2");19 btOk = (Button)findViewById(R.id.btOK);20 et = (EditText)findViewById(R.id.et);21 btOk.setOnClickListener(new View.OnClickListener() {22 @Override23 public void onClick(View view) {24 String str = et.getText().toString();25 Uri data = Uri.parse("来自NewActivity2的消息" + str);26 Intent result = new Intent(null, data);27 setResult(-1, result);28 finish();29 }30 });31 }32 }
NewActivity2
1 <?xml version="1.0" encoding="utf-8"?> 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 3 xmlns:app="http://schemas.android.com/apk/res-auto" 4 xmlns:tools="http://schemas.android.com/tools" 5 android:layout_width="match_parent" 6 android:layout_height="match_parent" 7 android:gravity="center" 8 tools:context=".MainActivity" 9 android:orientation="vertical">10 <Button11 android:id="@+id/bt1"12 android:layout_width="match_parent"13 android:layout_height="wrap_content"14 android:layout_weight="0.2"15 android:text="进入NewActivity1！" />16 17 <Button18 android:id="@+id/bt2"19 android:layout_width="match_parent"20 android:layout_height="wrap_content"21 android:layout_weight="0.2"22 android:text="进入NewActivity2！" />23 <TextView24 android:id="@+id/tv"25 android:layout_width="match_parent"26 android:layout_height="wrap_content"27 android:layout_weight="0.6"28 android:text="" />29 30 </LinearLayout>
layout\activity_main.xml
1 <?xml version="1.0" encoding="utf-8"?> 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 3 android:orientation="vertical" 4 android:layout_width="match_parent" 5 android:layout_height="match_parent" 6 android:gravity="center" > 7 8 <LinearLayout 9 android:layout_width="match_parent"10 android:layout_height="wrap_content"11 android:orientation="horizontal"12 android:gravity="center" >13 14 <TextView15 android:id="@+id/tv"16 android:layout_width="wrap_content"17 android:layout_height="wrap_content"18 android:layout_weight="0.2"19 android:text="回信:" />20 21 <EditText22 android:id="@+id/et"23 android:layout_width="wrap_content"24 android:layout_height="wrap_content"25 android:layout_weight="0.8" />26 </LinearLayout>27 28 29 <Button30 android:id="@+id/btOK"31 android:layout_width="match_parent"32 android:layout_height="wrap_content"33 android:text="确定" />34 </LinearLayout>
layout\activity_new1.xml
