ActivityCollertor（活动控制器）

最新推荐文章于 2018-08-10 14:47:57 发布

HanDong_

最新推荐文章于 2018-08-10 14:47:57 发布

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分类专栏： android

本文链接：https://blog.youkuaiyun.com/kongchengjiumenghx/article/details/50204343

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本文详细介绍了 Android 开发中 Activity 的生命周期方法，包括 onCreate、onStart、onResume、onPause、onStop、onDestroy 和 onSaveInstanceState 等方法的调用时机及作用。同时展示了如何通过按钮触发不同 Activity 之间的跳转。

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package com.example.first_code;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.EditText;


/**
 * @author HD
 * @date 2015-12-7
 * @package_name com.example.first_code
 * @file_name MainActivity.java
 */
public class MainActivity extends Activity {
    private Button mButton;
    private Button mButton2;
    private EditText mEditText;
    private String editStr;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ActivityCollertor.addActivity(this);
        MainActivity.this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        Log.i("hhhd", "onCreate");
        setContentView(R.layout.activity_main);
        if(savedInstanceState != null){
            editStr = savedInstanceState.getString("editStr");
            Log.i("hhhd", "--->>"+editStr);
        }

        mButton = (Button) findViewById(R.id.button1);
        mButton2 = (Button) findViewById(R.id.button2);
        mEditText = (EditText) findViewById(R.id.editText1);

        mButton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO 自动生成的方法存根
                Intent intent = new Intent();
                intent.setClass(MainActivity.this, Second_Activity.class);
                startActivity(intent);
            }
        });

        mButton2.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO 自动生成的方法存根
                Intent intent = new Intent();

                intent.setClass(MainActivity.this, DialogActivity.class);
                startActivity(intent);
            }
        });
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        // TODO 自动生成的方法存根
        outState.putString("editStr", "dfsdaf");
        super.onSaveInstanceState(outState);
        Log.i("hhhd", "onSaveInstanceState");
    }


    @Override
    protected void onStart() {
        // TODO 自动生成的方法存根
        super.onStart();
        Log.i("hhhd", "onStart");
    }

    @Override
    protected void onResume() {
        // TODO 自动生成的方法存根
        super.onResume();
        Log.i("hhhd", "onResume");
    }

    @Override
    protected void onPause() {
        // TODO 自动生成的方法存根
        super.onPause();
        Log.i("hhhd", "onPause");
    }

    @Override
    protected void onStop() {
        // TODO 自动生成的方法存根
        super.onStop();
        Log.i("hhhd", "onStop");
    }

    @Override
    protected void onDestroy() {
        // TODO 自动生成的方法存根
        super.onDestroy();
        Log.i("hhhd", "onDestroy");
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        // TODO 自动生成的方法存根
        Log.i("hhhd", "onRestoreInstanceState");
        super.onRestoreInstanceState(savedInstanceState);
    }

}

package com.example.first_code;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;


/**
 * @author HD
 * @date 2015-12-7
 * @package_name com.example.first_code
 * @file_name ActivityCollertor.java
 */
public class ActivityCollertor {

    public static List<Activity> activities = new ArrayList<Activity>();

    public static void addActivity(Activity activity){
        activities.add(activity);
    }

    public static void removeActivity(Activity activity){
        activities.remove(activity);
    }

    public static void finishAll(){
        for(Activity activity: activities){
            if(!activity.isFinishing()){
                activity.finish();
            }
        }
    }
}

package com.example.first_code;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

/**
 * @author HD
 * @date 2015-12-7
 * @package_name com.example.first_code
 * @file_name DialogActivity.java
 */
public class DialogActivity extends Activity {
    private Button mButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO 自动生成的方法存根
        super.onCreate(savedInstanceState);
        ActivityCollertor.addActivity(this);
        setContentView(R.layout.third_activity);
        mButton = (Button) findViewById(R.id.button31);
        mButton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO 自动生成的方法存根
                ActivityCollertor.finishAll();
            }
        });
    }


}

package com.example.first_code;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

/**
 * @author HD
 * @date 2015-12-7
 * @package_name com.example.first_code
 * @file_name Second_Activity.java
 */
public class Second_Activity extends Activity {

    private Button mButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO 自动生成的方法存根
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second_activity);
        ActivityCollertor.addActivity(this);
        mButton = (Button) findViewById(R.id.button22);
        mButton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO 自动生成的方法存根
                Intent intent = new Intent();
                intent.setClass(Second_Activity.this, DialogActivity.class);
                startActivity(intent);
            }
        });
    }

    @Override
    public void onBackPressed() {
        // TODO 自动生成的方法存根
        super.onBackPressed();
        Toast.makeText(getApplicationContext(), "你按了回退键", Toast.LENGTH_SHORT)
                .show();
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        // TODO 自动生成的方法存根
        super.onSaveInstanceState(outState);
        Log.i("hhhd", "second onSaveInstanceState");
    }
}

<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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.first_code.MainActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView1"
        android:layout_marginLeft="46dp"
        android:layout_marginTop="158dp"
        android:layout_toRightOf="@+id/textView1"
        android:text="启动第二个Activity" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/button1"
        android:layout_below="@+id/button1"
        android:layout_marginRight="38dp"
        android:layout_marginTop="68dp"
        android:text="隐式Intent启动" />

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="56dp"
        android:maxLines="2"
        android:ems="10" >
    </EditText>

</RelativeLayout>

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

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="这是第二个Activity" />

    <Button
        android:id="@+id/button22"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />

</LinearLayout>

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

    <Button
        android:id="@+id/button31"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.first_code"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="21" />

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

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".Second_Activity" >
            <intent-filter>
                <action android:name="com.example.first_code.ACTION" />
                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.MyCategory" />

                <data android:scheme="http" />
            </intent-filter>
        </activity>
        <activity android:name=".DialogActivity" >
        </activity>
    </application>

</manifest>