Android应用源码之8.Activity生命周期.zip项目安卓应用源码下载

package com.szy.activity; import android.app.Activity; 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; public class MainActivity extends Activity { private final static String TAG="MainActivity"; private Button secondBtn=null; private Button thirdBtn=null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); secondBtn=(Button)findViewById(R.id.secondBtn); thirdBtn=(Button)findViewById(R.id.thirdBtn); secondBtn.setOnClickListener(listener); thirdBtn.setOnClickListener(listener); Log.i(TAG, "MainActivity-->onCreate"); } @Override protected void onDestroy() { super.onDestroy(); Log.i(TAG, "MainActivity-->onDestroy"); } @Override protected void onPause() { super.onPause(); Log.i(TAG, "MainActivity-->onPause"); try { Thread.sleep(2000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } @Override protected void onRestart() { super.onRestart(); Log.i(TAG, "MainActivity-->onRestart"); } @Override protected void onResume() { super.onResume(); Log.i(TAG, "MainActivity-->onResume"); } @Override protected void onStart() { super.onStart(); Log.i(TAG, "MainActivity-->onStart"); } @Override protected void onStop() { super.onStop(); Log.i(TAG, "MainActivity-->onStop"); } private OnClickListener listener=new OnClickListener() { @Override public void onClick(View v) { Button btn=(Button)v; Intent intent=new Intent(); switch (btn.getId()) { case R.id.secondBtn: intent.setClass(MainActivity.this, SecondActivity.class); break; case R.id.thirdBtn: intent.setClass(MainActivity.this, ThirdActivity.class); break; } startActivity(intent); } }; }