安卓--组建通信

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。

 

package com.flyuz.myapplication;

import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    Button bt1;
    Button bt2;
    TextView tv;
    final int SUBACTIVITY1 = 1;
    final int SUBACTIVITY2 = 2;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setTitle("MainActivity");
        bt1 = (Button) findViewById(R.id.bt1);
        bt2 = (Button) findViewById(R.id.bt2);
        tv = (TextView) findViewById(R.id.tv);
        bt1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this, NewActivity1.class);
                startActivityForResult(intent, SUBACTIVITY1);
            }
        });
        bt2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this, NewActivity2.class);
                startActivityForResult(intent, SUBACTIVITY2);
            }
        });
    }

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        switch (requestCode) {
            case SUBACTIVITY1:
                if (resultCode == 1) {
                    Uri uriData = data.getData();
                    tv.setText(uriData.toString());
                }
            case SUBACTIVITY2:
                if (resultCode == -1) {
                    Uri uriData = data.getData();
                    tv.setText(uriData.toString());
                }
        }
    }
}

package com.flyuz.myapplication;

import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.content.Intent;

public class NewActivity1 extends AppCompatActivity {
    Button btOk;
    EditText et;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_new1);
        setTitle("NewActivity1");
        btOk = (Button)findViewById(R.id.btOK);
        et = (EditText)findViewById(R.id.et);
        btOk.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String str = et.getText().toString();
                Uri data = Uri.parse("来自NewActivity1的消息" + str);
                Intent result = new Intent(null, data);
                setResult(1, result);
                finish();
            }
        });
    }
}

package com.flyuz.myapplication;

import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.content.Intent;

public class NewActivity2 extends AppCompatActivity {
    Button btOk;
    EditText et;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_new1);
        setTitle("NewActivity2");
        btOk = (Button)findViewById(R.id.btOK);
        et = (EditText)findViewById(R.id.et);
        btOk.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String str = et.getText().toString();
                Uri data = Uri.parse("来自NewActivity2的消息" + str);
                Intent result = new Intent(null, data);
                setResult(-1, result);
                finish();
            }
        });
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    tools:context=".MainActivity"
    android:orientation="vertical">
    <Button
        android:id="@+id/bt1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="0.2"
        android:text="进入NewActivity1！" />

    <Button
        android:id="@+id/bt2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="0.2"
        android:text="进入NewActivity2！" />
    <TextView
        android:id="@+id/tv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="0.6"
        android:text="" />

</LinearLayout>

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

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:gravity="center" >

        <TextView
            android:id="@+id/tv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="0.2"
            android:text="回信:" />

        <EditText
            android:id="@+id/et"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="0.8" />
    </LinearLayout>


    <Button
        android:id="@+id/btOK"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="确定" />
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.flyuz.myapplication">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <activity android:name=".NewActivity1">
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>

        <activity android:name=".NewActivity2">
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>

    </application>

</manifest>

 隐式启动：

        bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent("android.intent.action.VIEW"); //<action android:name="android.intent.action.VIEW" /> 这里的
                Toast.makeText(getApplicationContext(), "隐式启动", Toast.LENGTH_SHORT).show();
                startActivityForResult(intent, SUBACTIVITY);
            }
        });