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Andorid development III (intent)

2022-07-28 10:41:00 【Upper back left love】

Intent

take Activity 、Serivce 、 BroadReceive Communication between Use Intent

Intent Object properties ：
1.Action, 2. Data 3.Category 4. Extras 5.Flags 6.Component name
Component name:
Set up Intnet Component object name adopt Package name + Class name Determine the only one activity
similar Spring in Component according to component name Set or start specific components

setComponent(componentName)

Intnet intnet = new Intnet();
ComponentName componentName = new ComponentName("com.example","com.example.DetailActivity");
intnet.setComponent(componentName);
startActivity(intnet)

Action & Data
Next action and Corresponding data
Action Properties and Data attribute

The first step is manifest Set the permission to open phone and email

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.myapplication">
    <uses-permission android:name="android.permission.CALL_PHONE"></uses-permission>
    <uses-permission android:name="android.permission.SEND_SMS"></uses-permission>
    <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>
        <!--   Customize Activity  Need to be in mainifests  Configuration statement        -->

    </application>

</manifest>

package com.example.myapplication;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;

import androidx.appcompat.app.AppCompatActivity;

/** *  function ： Action Data  share   Click to make a call   and   Send mail button   Conduct   Jump system   Make a phone call   And email interface  * * * */
public class MainActivity extends AppCompatActivity {
    

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ImageButton phoneButton =  findViewById(R.id.imageButton_phone);
        ImageButton smsButton = findViewById(R.id.imageButton_sms);

        phoneButton.setOnClickListener(l);
        smsButton.setOnClickListener(l);
    }

    //  Define listener objects   Methods share 
    View.OnClickListener l = new View.OnClickListener() {
    
        @Override
        public void onClick(View view) {
    

            Intent intent = new Intent();

            ImageButton imageButton = (ImageButton) view;

            switch (imageButton.getId()){
    
                case R.id.imageButton_phone:
                 //  Call the dial panel 
                    intent.setAction(intent.ACTION_DIAL);
                    intent.setData(Uri.parse("tel: 043184978981"));
                    startActivity(intent);
                    break;
                case R.id.imageButton_sms:
                    intent.setAction(intent.ACTION_SENDTO);
                    intent.setData(Uri.parse("smsto: 5554"));
                    //  Set SMS content 
                    intent.putExtra("sms_body", "welcome to Android");
                    startActivity(intent);
                    break;


            }

        }
    };


}

``<?xml version="1.0" encoding="utf-8"?>
<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:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/text1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=" Technical support ： Jilin tomorrow Technology Co., Ltd "
        android:layout_marginTop="20dp"/>

    <TextView
        android:id="@+id/text2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=" website ：http://www.mingrisoft.com"
        android:layout_marginTop="10dp"
        android:layout_below="@+id/text1"/>
    <TextView
        android:id="@+id/text3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=" Enterprise mailbox ：[email protected]"
        android:layout_marginTop="10dp"
        android:layout_below="@+id/text2"/>
    <TextView
        android:id="@+id/text4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=" Technical Service Hotline ：0431-84978981"
        android:layout_marginTop="10dp"
        android:layout_below="@+id/text3"/>
    <ImageButton
        android:id="@+id/imageButton_phone"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/phone"
        android:layout_below="@+id/text4"
        android:layout_marginTop="30dp"
        android:background="#0000"
        android:scaleType="fitXY"
        />
    <ImageButton
        android:id="@+id/imageButton_sms"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@+id/imageButton_phone"
        android:layout_below="@+id/text4"
        android:layout_marginTop="30dp"
        android:layout_marginLeft="30dp"
        android:background="#0000"
        android:scaleType="fitXY"
        android:src="@drawable/sms"/>
</RelativeLayout>

Action & Category
Category attribute take Activity To classify , To the corresponding Activity To classify

package com.example.myapplication;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.WindowManager;
import android.widget.ImageButton;

import androidx.appcompat.app.AppCompatActivity;

/**
 *   function ： Action Data  share   Click to make a call   and   Send mail button   Conduct   Jump system   Make a phone call   And email interface 
 *
 *
 * */
public class MainActivity extends AppCompatActivity {
    

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Set the full screen display 
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        ImageButton imageButton= (ImageButton) findViewById(R.id.imageButton1); // obtain ImageView Components 
        // by ImageView Component settings click event listener 
        imageButton.setOnClickListener(new View.OnClickListener(){
    

            @Override
            public void onClick(View view) {
    
                Intent intent = new Intent();
                
                intent.setAction(intent.ACTION_MAIN);
                intent.addCategory(intent.CATEGORY_HOME);
            }
        });
    }

    


}

Flags attribute
effect ： Let the current activity Not in the history stack , When the user leaves app When entering again Not now Activity Interface Go to the main interface of the system

Intnet species

Show Intnet：

establish Intnet object -> Target component -> start-up Target component ：

Intnet intnet = new Intnet(MainActivity.this,  call Activity object )

Implicit Intnet
Creating objects does not specify Target component , adopt action , category , data Give Way Android The system automatically matches the target component

difference ： Show Directly specify the name of the target component , It is often used to transfer information inside applications
Implicit Intnet： The activated target component will not be defined with the component name , It is often used to transfer information between different applications

Intent Filter

Activity A adopt category + action + data As Filter The conditions are selected ActivityB Is the target Activity

1. stay AndroidManifest.xml Configuration in file

 <intent-filter>
 	<category></category>
 	<action></action>
 </intnet-filter>
 <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>