（一）Activity和Fragment生命周期：通过回调函数观察生命周期

最新推荐文章于 2022-03-07 20:56:01 发布

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本文详细解读了Android应用中MainActivity和Fragment1的源码，包括生命周期方法和XML布局文件，展示了如何在Android环境中实现页面跳转和组件交互。

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<pre name="code" class="java"><strong>MainActivity.java源码：</strong>

package com.ctcc.fragmenttest.app;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;

public class MainActivity extends Activity {

    private static final String TAG = "MainActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d(TAG,"onCreate");
        setContentView(R.layout.activity_main);
    }

    @Override
    public void onStart(){
        super.onStart();
        Log.d(TAG,"onStart");
    }

    @Override
    public void onResume(){
        super.onResume();
        Log.d(TAG,"onResume");
    }

    @Override
    public void onPause(){
        super.onPause();
        Log.d(TAG,"onPause");
    }

    @Override
    public void onStop(){
        super.onStop();
        Log.d(TAG,"onStop");
    }

    @Override
    public void onDestroy(){
        super.onDestroy();
        Log.d(TAG,"onDestroy");
    }
}

<pre name="code" class="java"><strong>activity_main.xml源码：</strong>

</pre><pre name="code" class="html"><LinearLayout 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"
    tools:context="${relativePackage}.${activityClass}">

    <TextView
        android:text="@string/hello_world"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <fragment
            android:id="@+id/fragment"
            android:name="com.ctcc.fragmenttest.app.Fragment1"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"/>

</LinearLayout>

<strong>Fragment1.java源码：</strong>

package com.ctcc.fragmenttest.app;

import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

/**
 * Created by Zouyiran on 2015/7/26.
 */
public class Fragment1 extends Fragment {

    private static final String TAG = "Fragment1";

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle saveInstanceState){
        Log.d(TAG, "onCreateView");
        return inflater.inflate(R.layout.fragment1, container, false);
    }

    @Override
    public void onAttach(Activity activity){
        super.onAttach(activity);
        Log.d(TAG,"onAttach");
    }

    @Override
    public void onCreate(Bundle saveInstanceState){
        super.onCreate(saveInstanceState);
        Log.d(TAG,"onCreate");
    }

    @Override
    public void onActivityCreated(Bundle saveInstanceState){
        super.onCreate(saveInstanceState);
        Log.d(TAG,"onActivityCreated");
    }

    @Override
    public void onStart(){
        super.onStart();
        Log.d(TAG,"onStart");
    }

    @Override
    public void onResume(){
        super.onResume();
        Log.d(TAG,"onResume");
    }

    @Override
    public void onPause(){
        super.onPause();
        Log.d(TAG,"onPause");
    }

    @Override
    public void onStop(){
        super.onStop();
        Log.d(TAG,"onStop");
    }

    @Override
    public void onDestroyView(){
        super.onDestroyView();
        Log.d(TAG,"onDestroyView");
    }

    @Override
    public void onDestroy(){
        super.onDestroy();
        Log.d(TAG,"onDestroy");
    }

    @Override
    public void onDetach(){
        super.onDetach();
        Log.d(TAG,"onDetach");
    }
}

<pre name="code" class="java"><strong>fragment1.xml源码：</strong>

</pre><pre name="code" class="html"><LinearLayout 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"
    tools:context="${relativePackage}.${activityClass}">

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

</LinearLayout>

通过Andoird DDMS 的Logcat参看运行结果：