Android官方activity-lifecycle生命周期例子

/* * Copyright (C) 2012 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.example.android.lifecycle; import android.app.Activity; import android.content.Intent; import android.content.res.Configuration; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.TextView; import com.example.android.lifecycle.util.StatusTracker; import com.example.android.lifecycle.util.Utils; /** * Example Activity to demonstrate the lifecycle callback methods. */ public class ActivityA extends Activity { private String mActivityName; private TextView mStatusView; private TextView mStatusAllView; private StatusTracker mStatusTracker = StatusTracker.getInstance(); private static final String LOGTAG = "ActivityA"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_a); mActivityName = getString(R.string.activity_a); mStatusView = (TextView)findViewById(R.id.status_view_a); mStatusAllView = (TextView)findViewById(R.id.status_view_all_a); mStatusTracker.setStatus(mActivityName, getString(R.string.on_create)); Utils.printStatus(mStatusView, mStatusAllView); Log.d(LOGTAG,"ActivityA.onCreate()"); } @Override public void onRestoreInstanceState(Bundle savedInstanceState) { super.onRestoreInstanceState(savedInstanceState); String myString = savedInstanceState.getString("MyString"); mStatusTracker.setStatus(mActivityName, getString(R.string.on_RestoreInstanceState)); Utils.printStatus(mStatusView, mStatusAllView); Log.d(LOGTAG,"ActivityA.onRestoreInstanceState() " + myString); } @Override protected void onStart() { super.onStart(); mStatusTracker.setStatus(mActivityName, getString(R.string.on_start)); Utils.printStatus(mStatusView, mStatusAllView); Log.d(LOGTAG,"ActivityA.onStart()"); } @Override protected void onRestart() { super.onRestart(); mStatusTracker.setStatus(mActivityName, getString(R.string.on_restart)); Utils.printStatus(mStatusView, mStatusAllView); Log.d(LOGTAG,"ActivityA.onRestart()"); } @Override protected void onResume() { super.onResume(); mStatusTracker.setStatus(mActivityName, getString(R.string.on_resume)); Utils.printStatus(mStatusView, mStatusAllView); Log.d(LOGTAG,"ActivityA.onResume()"); } @Override public void onSaveInstanceState(Bundle savedInstanceState) { // Save the user's current game state savedInstanceState.putString("MyString", "Welcome back to Android"); mStatusTracker.setStatus(mActivityName, getString(R.string.on_SaveInstanceState)); Utils.printStatus(mStatusView, mStatusAllView); Log.d(LOGTAG,"ActivityA.onSaveInstanceState()"); // Always call the superclass so it can save the view hierarchy state super.onSaveInstanceState(savedInstanceState); } @Override protected void onPause() { super.onPause(); mStatusTracker.setStatus(mActivityName, getString(R.string.on_pause)); Utils.printStatus(mStatusView, mStatusAllView); Log.d(LOGTAG,"ActivityA.onPause()"); } @Override protected void onStop() { super.onStop(); mStatusTracker.setStatus(mActivityName, getString(R.string.on_stop)); Log.d(LOGTAG,"ActivityA.onStop()"); } @Override protected void onDestroy() { super.onDestroy(); mStatusTracker.setStatus(mActivityName, getString(R.string.on_destroy)); mStatusTracker.clear(); Log.d(LOGTAG,"ActivityA.onDestroy()"); } public void startDialog(View v) { Intent intent = new Intent(ActivityA.this, DialogActivity.class); startActivity(intent); } public void startActivityB(View v) { Intent intent = new Intent(ActivityA.this, ActivityB.class); startActivity(intent); } public void startActivityC(View v) { Intent intent = new Intent(ActivityA.this, ActivityC.class); startActivity(intent); } public void finishActivityA(View v) { ActivityA.this.finish(); } //当指定了android:configChanges="orientation"后,方向改变时onConfigurationChanged被调用 @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); mStatusTracker.setStatus(mActivityName, getString(R.string.on_ConfigurationChanged)); Log.d(LOGTAG,"ActivityA.onConfigurationChanged()"); switch (newConfig.orientation) { case Configuration.ORIENTATION_PORTRAIT: //setContentView(R.layout.orientation_portrait); break; case Configuration.ORIENTATION_LANDSCAPE: //setContentView(R.layout.orientation_landscape); break; } } }