android Activity生命周期

android Activity生命周期

package org.yiqun.guess;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class QuizActivity extends Activity {
private static final String TAG="QuizActivity";
private static final String KEY_INDEX="index";

Button mTrueButton;
Button mFalseButton;
Button mNextButton;

TextView mQuestionTextView;

TrueFalse[] mAnswerKey = new TrueFalse[] {
new TrueFalse(R.string.question_oceans, true),
new TrueFalse(R.string.question_mideast, false),
new TrueFalse(R.string.question_africa, false),
new TrueFalse(R.string.question_americas, true),
new TrueFalse(R.string.question_asia, true)
};
//Executors
//ExecutorService;
int mCurrentIndex = 0;

private void updateQuestion() {
int question = mAnswerKey[mCurrentIndex].getQuestion();
mQuestionTextView.setText(question);
}
/**
* 在Bundle中存储*/
private void checkAnswer(boolean userPressedTrue) {
boolean answerIsTrue = mAnswerKey[mCurrentIndex].isTrueQuestion();

int messageResId = 0;

if (userPressedTrue == answerIsTrue) {
messageResId = R.string.correct_toast;
} else {
messageResId = R.string.incorrect_toast;
}

Toast.makeText(this, messageResId, Toast.LENGTH_SHORT)
.show();
}

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.d(TAG, "1: onCreate() called");
setContentView(R.layout.activity_quiz);

mQuestionTextView = (TextView)findViewById(R.id.question_text_view);
//set text to first question in array

mTrueButton = (Button)findViewById(R.id.true_button);
mTrueButton.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
checkAnswer(true);
}
});

mFalseButton = (Button)findViewById(R.id.false_button);
mFalseButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
checkAnswer(false);
}
});

mNextButton = (Button)findViewById(R.id.next_button);
mNextButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mCurrentIndex = (mCurrentIndex + 1) % mAnswerKey.length;
updateQuestion();
}
});
if (savedInstanceState !=null) {
mCurrentIndex=savedInstanceState.getInt(KEY_INDEX, 0);
}
updateQuestion();
}
@Override
public void onSaveInstanceState(Bundle savedInstanceState){
super.onSaveInstanceState(savedInstanceState);
Log.i(TAG, "onSaveInstanceState");
savedInstanceState.putInt(KEY_INDEX, mCurrentIndex);
}

@Override
public  void onStart() {
super.onStart();
Log.i(TAG,"2: onStart() called");
}

@Override
public void onResume() {
super.onResume();
Log.i(TAG, "3: onResume() called");
}

@Override
public  void onPause() {
super.onPause();
Log.i(TAG, "4: onPause() called");
}
@Override
public void onStop(){
super.onStop();
Log.i(TAG, "5: onStop() called");
}
@Override
public void onDestroy(){
super.onDestroy();
Log.i(TAG, "6: onDestroy() called");
}

@Override
public void onRestart(){
super.onRestart();
Log.i(TAG, "7: onRestart() called");
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_quiz, menu);
return true;
}

}