Android Activity的生命周期
1. 啟動Activity:onCreate()->onStart()->onResume()->Activity is running2. 按back鍵返回:onPause()->onStop()->onDestroy() 再次啟動時:onCreate()->onStart()->onResume()->Activity is running
3.按home鍵返回:onPause()->onStop() 再次啟動時:onRestart()->onStart()->onResume()->Activity is running
4.切換到別的Activity(當前Activity不finish): onPause()->onStop() 再次啟動時:onCreate()->onStart()->onResume()->Activity is running
5.切換到別的Activity(當前Activity finish): onPause()->onStop()->onDestroy() 再次啟動時:onCreate()->onStart()->onResume()->Activity is running
package com.Aina.Android; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; public class Test_CeShi extends Activity { /** Called when the activity is first created. */ private int i = 1; private Button btn; /** * 創建 */ @Override public void onCreate(Bundle savedInstanceState) { Log.i("TAG-onCreate", "onCreate()------------" + (i++)); super.onCreate(savedInstanceState); setContentView(R.layout.main); btn = (Button) this.findViewById(R.id.Button01); btn.setOnClickListener(new Button.OnClickListener(){ @Override public void onClick(View v) { Intent intent = new Intent(Test_CeShi.this,fg.class); Test_CeShi.this.startActivity(intent); // Test_CeShi.this.finish(); } }); } /** * 重新開始 */ @Override protected void onRestart() { Log.i("TAG-onRestart", "onRestart()------------" + (i++)); super.onRestart(); } /** * 啟動 */ @Override protected void onStart() { Log.i("TAG-onStart", "onStart()------------" + (i++)); super.onStart(); } /** * 重新啟動 */ @Override protected void onResume() { Log.i("TAG-onResume", "onResume()------------" + (i++)); super.onResume(); } /** * 暫停 */ @Override protected void onPause() { Log.i("TAG-onPause", "onPause()------------" + (i++)); super.onPause(); } /** * 停止 */ @Override protected void onStop() { Log.i("TAG-onStop", "onStop()------------" + (i++)); super.onStop(); } /** * 銷毀 */ @Override protected void onDestroy() { Log.i("TAG-onDestroy", "onDestroy()------------" + (i++)); super.onDestroy(); } }