Android开发-前后端控制器intent

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Android开发-前后端控制器intent

sf2gis@163.com

2015年12月26日

1 目标：不同的Activity之间传递数据。

2 原理：ActivityManager管理Activity，Intent指定要启动的Activity交由ActivityManager启动，使用Intent的Bindle键值对属性传递数据。

参考：http://bbs.csdn.net/topics/390533171

ActivityManager管理所有Activity（带有Intent属性）。

并在startActivity时设置Intent属性（包括目标Activity和数据）。

Intent中包含Bundle对象，所有数据操作都通过设置此Bundle进行。

3 流程：设置Intent的目标Activity，设置传递参数。创建目标Activity，获取Intent属性。

3.1 设置Intent的目标Activity，设置传递参数。

Intent intent = new Intent(this,MyAct.class);
intent.putExtra("name","xx");
startActivity(intent);

3.2 创建目标Activity，获取Intent属性。

Intent intent = getIntent();

Stringname=intent.getStringExtra("name");

3.3 示例

//activity_main.xml

<?xmlversion="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
   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:fitsSystemWindows="true"
   tools:context=".MainActivity">

    <android.support.design.widget.AppBarLayoutandroid:layout_height="wrap_content"
       android:layout_width="match_parent"android:theme="@style/AppTheme.AppBarOverlay">

       <android.support.v7.widget.Toolbarandroid:id="@+id/toolbar"
           android:layout_width="match_parent"android:layout_height="?attr/actionBarSize"
           android:background="?attr/colorPrimary"app:popupTheme="@style/AppTheme.PopupOverlay" />

   </android.support.design.widget.AppBarLayout>

    <includelayout="@layout/content_main" />

    <android.support.design.widget.FloatingActionButtonandroid:id="@+id/fab"
       android:layout_width="wrap_content"android:layout_height="wrap_content"
       android:layout_gravity="bottom|end"android:layout_margin="@dimen/fab_margin"
        android:src="@android:drawable/ic_dialog_email"/>

</android.support.design.widget.CoordinatorLayout>

//content_main.xml

<?xmlversion="1.0" encoding="utf-8"?>
<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
   xmlns:app="http://schemas.android.com/apk/res-auto"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"
   app:layout_behavior="@string/appbar_scrolling_view_behavior"
   tools:showIn="@layout/activity_main" tools:context=".MainActivity"
   android:id="@+id/rlayout">

    <TextView android:text="HelloWorld!" android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:id="@+id/textView" />

    <Button
        android:layout_width="wrap_content"
       android:layout_height="wrap_content"
        android:text="Show"
       android:id="@+id/button2"
       android:onClick="showActivity"
       android:layout_below="@+id/textView"
       android:layout_alignParentStart="true" />
</RelativeLayout>

//MainActivity.java

packagecom.lee.demo;

import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ImageView;
import android.widget.TextView;
import android.util.Log;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(BundlesavedInstanceState) {
       super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab =(FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(newView.OnClickListener() {
            @Override
            public void onClick(Viewview) {
                Snackbar.make(view,"Replace with your own action", Snackbar.LENGTH_LONG)
                       .setAction("Action", null).show();
            }
        });
    }

    //xml config
    public void showActivity(Viewsource){
        Intent intent = new Intent(this,MyAct.class);
       intent.putExtra("name","xx");
        startActivity(intent);
    }

    @Override
    public booleanonCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this addsitems to the action bar if it is present.
       getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public booleanonOptionsItemSelected(MenuItem item) {
       // Handle action bar item clicks here. Theaction bar will
        // automatically handle clicks onthe Home/Up button, so long
        // as you specify a parentactivity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspectionSimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        returnsuper.onOptionsItemSelected(item);
    }
}

//activity_my.xml

<?xmlversion="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
   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:fitsSystemWindows="true"
   tools:context="com.lee.demo.MyAct">

   <android.support.design.widget.AppBarLayoutandroid:layout_height="wrap_content"
       android:layout_width="match_parent"android:theme="@style/AppTheme.AppBarOverlay">

      <android.support.v7.widget.Toolbarandroid:id="@+id/toolbar"
           android:layout_width="match_parent"android:layout_height="?attr/actionBarSize"
           android:background="?attr/colorPrimary"app:popupTheme="@style/AppTheme.PopupOverlay" />

   </android.support.design.widget.AppBarLayout>

    <includelayout="@layout/content_my" />

   <android.support.design.widget.FloatingActionButtonandroid:id="@+id/fab"
       android:layout_width="wrap_content"android:layout_height="wrap_content"
       android:layout_gravity="bottom|end"android:layout_margin="@dimen/fab_margin"
       android:src="@android:drawable/ic_dialog_email" />

</android.support.design.widget.CoordinatorLayout>

//content_my.xml

<?xmlversion="1.0" encoding="utf-8"?>
<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:tools="http://schemas.android.com/tools"
   xmlns:app="http://schemas.android.com/apk/res-auto"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"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"tools:showIn="@layout/activity_my"
   tools:context="com.lee.demo.MyAct">

    <TextView
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
       android:text="MyActivity"
       android:id="@+id/textView7"
       android:layout_alignParentTop="true"
       android:layout_centerHorizontal="true"
       android:layout_marginTop="148dp" />

    <TextView
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
        android:text="New Text"
       android:id="@+id/textView8"
       android:layout_centerVertical="true"
       android:layout_centerHorizontal="true" />
</RelativeLayout>

//MyAct.java

package com.lee.demo;

import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.TextView;

import org.w3c.dom.Text;

public class MyAct extends AppCompatActivity {

    @Override
    protected void onCreate(BundlesavedInstanceState) {
      super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_my);
        Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        //get intent
        Intent intent = getIntent();
       Stringname=intent.getStringExtra("name");
       ((TextView)findViewById(R.id.textView8)).setText(name);

        FloatingActionButton fab =(FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(newView.OnClickListener() {
            @Override
            public void onClick(Viewview) {
                Snackbar.make(view,"Replace with your own action", Snackbar.LENGTH_LONG)
                       .setAction("Action", null).show();
            }
        });
    }

}

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