Activity生命周期

Activity生命周期

七个方法

onCreate(saveInstanceStack)

onStart()

onRestaet()

onResume()

onParse()

onStop()

onDestroy()

三个阶段

焦点转换onResume()——onParse()

整体周期onCreate()——-onDestroy()

可视周期onStart()———onStop()

<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>
        <!-->注册第二个Activity，并设置主题风格为窗口模式<-->
        <activity  android:name=".SecondActivity" android:theme="@android:style/Animation.Dialog">

        </activity>

package com.example.administrator.myapplication;

import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btn=(Button) findViewById(R.id.button);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(getApplicationContext(),SecondActivity.class);
               startActivity(intent);
            }
        });

        Log.d("myAlication","运行到onCreate");
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        int id = item.getItemId();

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

        return super.onOptionsItemSelected(item);
    }

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

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

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

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

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.d("myAlication", "onDestroy");
    }
    @Override
    public void onRestart() {
        super.onDestroy();
        Log.d("myAlication", "onRestart");
    }
}*********************************
public class SecondActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.test4);
        ImageView  im =(ImageView)findViewById(R.id.abc);
    }
    @Override
    public void onRestart() {
        super.onDestroy();
        Log.d("第二个antivity", "onRestart");
    }
    @Override
    public void onStart() {
        super.onStart();
        Log.d("第二个antivity", "onStart");
    }

    @Override
    public void onResume() {
        super.onResume();
        Log.d("第二个antivity", "onResume");
    }

    @Override
    public void onPause() {
        super.onPause();
        Log.d("第二个antivity", "onPause");
    }

    @Override
    public void onStop() {
        super.onStop();
        Log.d("第二个antivity", "onStop");
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.d("第二个antivity", "onDestroy");
    }
}