Android入门基础（7） ---activity生命周期

Android入门基础（7）

---activity生命周期

activity生命周期需要自己动手去亲自感受下，才会有收获。关键是如何很好的充分显示activity的生命周期，如何更好的利用好、控制好activity小生命，让我们对她的一举一动很了解。

接下来分享下自己测试activity的小例子。

本程序分两个activity，并且在第一个activity中有个dialog，测试dialog和activity的关系。代码为：

package com.activitytest.namespace;import android.app.Activity;import android.app.AlertDialog;import android.content.DialogInterface;import android.content.Intent;import android.os.Bundle;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageButton;import android.widget.ImageView;public class ActivitydemoActivity extends Activity {    static String log;    private ImageButton imageView1;    private Button  buttonOk;        /**     * 初始化     */    public ActivitydemoActivity(){     }    /**     * 结束程序     */    public void endita(){    finish();    }    /**     * find方法     */    public void findview() {imageView1=(ImageButton)findViewById(R.id.imageButton_one);buttonOk = (Button)findViewById(R.id.btn_ok);}    /**     * 所有的监听器     */    public void setLinsteners() {         OnClickListener lis=new OnClickListener(){       @Overridepublic void onClick(View v) {// TODO Auto-generated method stubIntent intent = new Intent();intent.setClass(ActivitydemoActivity.this,Second.class );endita();startActivity(intent);}};OnClickListener ok=new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubnew AlertDialog.Builder(ActivitydemoActivity.this).setTitle(R.string.mydia)                             .setMessage(R.string.mymessage)                             .setCancelable(true)                             .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {//对话框事件@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stub}}).show();}private AlertDialog setTitle(int mydia) {// TODO Auto-generated method stubreturn null;}};//点击后跳转到第二个页面imageView1.setOnClickListener(lis);//点击后弹出对话框buttonOk.setOnClickListener(ok);}/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);Log.e(log,"this is first onCreate");findview();setLinsteners();}/** * is second created *///@Override//    public void onRestore(){//    //    }@Overrideprotected void onResume() {// TODO Auto-generated method stubsuper.onResume();Log.e(log," the first onResume");}@Overrideprotected void onDestroy() {// TODO Auto-generated method stubsuper.onDestroy();Log.e(log,"the first onDestroy");}@Overrideprotected void onPause() {// TODO Auto-generated method stubsuper.onPause();Log.e(log,"the frist onpause");}@Overrideprotected void onRestart() {// TODO Auto-generated method stubsuper.onRestart();Log.e(log,"first onRestart");}@Overrideprotected void onStop() {// TODO Auto-generated method stubsuper.onStop();Log.e(log,"the first onShop");}@Overrideprotected void onStart() {// TODO Auto-generated method stubsuper.onStart();Log.e(log,"the first onstart");}}

package com.activitytest.namespace;import android.app.Activity;import android.os.Bundle;import android.util.Log;public class Second extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.second);Log.e(ActivitydemoActivity.log, "the seond onCreate");ActivitydemoActivity a = new ActivitydemoActivity();//a.endita();}protected void onResume() {// TODO Auto-generated method stubsuper.onResume();Log.e(ActivitydemoActivity.log," the S onResume");}@Overrideprotected void onDestroy() {// TODO Auto-generated method stubsuper.onDestroy();Log.e(ActivitydemoActivity.log,"the s onDestroy");}@Overrideprotected void onPause() {// TODO Auto-generated method stubsuper.onPause();Log.e(ActivitydemoActivity.log,"the s onpause");}@Overrideprotected void onRestart() {// TODO Auto-generated method stubsuper.onRestart();Log.e(ActivitydemoActivity.log,"S onRestart");}@Overrideprotected void onStop() {// TODO Auto-generated method stubsuper.onStop();Log.e(ActivitydemoActivity.log,"the S onShop");}@Overrideprotected void onStart() {// TODO Auto-generated method stubsuper.onStart();Log.e(ActivitydemoActivity.log,"the S onstart");}}

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