标签：user 重写 科技 warning 子类 定义 boolean ubi pac
Android开发是指android平台上应用的制作，Android早期由“Android之父”之称的Andy Rubin创办，Google于2005年并购了成立仅22个月的高科技企业Android，展开了短信、手机检索、定位等业务，以Java为编程语言，使接口到功能，都有层出不穷的变化。
第一次写博客，感觉很奇妙，想了好久，还没有思路，到底写什么呢？仍记得，初高中写作文时，假如对文题没有头绪，就会选择编个故事，把自己当作其中的主角，想其所想，悟其所悟，体会其中的冷暖寒凉，然后一篇1000字的文章就写完了。这个时候，想着想着，渐渐有所感悟。博客记录的是一个程序员进行项目开发的所思所悟，这个贵在积累，每天一点点，既是对自己的总结又能将自己的经历与网友共勉。所以现在想来，博客也并没有那么难了，因为这是为自己书写的。
注意：
1、选择合适的SDK版本
2、注意子类名的Activity后缀，这是种规范的命名方式
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical"> <TextView android:id="@+id/question_text_view" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="24dp" /> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android:id="@+id/true_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/true_button"/> <Button android:id="@+id/false_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/false_button"/> </LinearLayout> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content"> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/prev_button" android:text="@string/prev_button"/> <Button android:id="@+id/next_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/next_button"/> </LinearLayout> <Button android:id="@+id/cheat_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="bottom|center_horizontal" android:text="@string/cheat_button"/> </LinearLayout>
LinearLayout有两个子组件：TextView、LinearLayout。
若作为子组件的LinearLayout，还自带两个button组件。
组件的俩属性：match_parent、wrap_content
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.d(TAG,"onCreate(Bundle)called");
setContentView(R.layout.activity_quiz);
if(savedInstanceState !=null){
mCurrentIndex = savedInstanceState.getInt(KEY_INDEX,0);
}
mQuestionTextView = (TextView) findViewById(R.id.question_text_view);
mTrueButton = (Button) findViewById(R.id.true_button);
mTrueButton.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
Toast.makeText(QuizActivity.this,R.string.incorrect_toast,Toast.LENGTH_SHORT).show();
checkAnswer(true);
}
});
mFalseButton = (Button) findViewById(R.id.false_button);
mFalseButton.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
Toast.makeText(QuizActivity.this,R.string.correct_toast,Toast.LENGTH_SHORT).show();
checkAnswer(false);
}
});
package edu.niit.software.geoquiz;
import android.content.Context;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class CheatActivity extends AppCompatActivity {
private static final String EXTRA_ANSWER_IS_TRUE="edu.niit.software.geoquiz.answer_is_true";
private static final String EXTRA_ANSWER_SHOWN = "edu.niit.software.geoquiz.answer_shown";
private boolean mAnswerIsTrue;
private TextView mAnswerTextView;
private Button mShowAnswerButton;
public static Intent newIntent(Context packageContext , boolean answerIsTrue){
Intent intent = new Intent(packageContext,CheatActivity.class);
intent.putExtra(EXTRA_ANSWER_IS_TRUE,answerIsTrue);
return intent;
}
public static boolean wasAnswerShown(Intent result){
return result.getBooleanExtra(EXTRA_ANSWER_SHOWN,false);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cheat);
mAnswerIsTrue = getIntent().getBooleanExtra(EXTRA_ANSWER_IS_TRUE,false);
mAnswerTextView = (TextView) findViewById(R.id.answer_text_view);
mShowAnswerButton = (Button) findViewById(R.id.show_answer_button);
mShowAnswerButton.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
if(mAnswerIsTrue){
mAnswerTextView.setText(R.string.true_button);
}else {
mAnswerTextView.setText(R.string.false_button);
}
setAnswerShownResult(true);
}
});
}
private void setAnswerShownResult(boolean isAnswerShown){
Intent data = new Intent();
data.putExtra(EXTRA_ANSWER_SHOWN,isAnswerShown);
setResult(RESULT_OK,data);
}
}
package edu.niit.software.geoquiz;
/**
* Created by 666 on 2017/9/4.
*/
public class Question {
private int mTextResId;
private boolean mAnswerTrue;
public Question(int textResId,boolean answertrue){
mTextResId = textResId;
mAnswerTrue = answertrue;
}
public int getTextResId() {
return mTextResId;
}
public void setTextResId(int textResId) {
mTextResId = textResId;
}
public boolean isAnswerTrue() {
return mAnswerTrue;
}
public void setAnswerTrue(boolean answerTrue) {
mAnswerTrue = answerTrue;
}
}
package edu.niit.software.geoquiz;
import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class QuizActivity extends AppCompatActivity {
private Button mTrueButton;
private Button mFalseButton;
private Button mNextButton;
private Button mPrevButton;
private Button mCheatButton;
private TextView mQuestionTextView;
private static final String TAG = "QuizActivity";
private static final String KEY_INDEX = "index";
private static final int REQUEST_CODE_CHEAT = 0;
private Question[] mQuestionBank = new Question[]{
new Question(R.string.question_australia ,true),
new Question(R.string.question_oceans,true),
new Question(R.string.question_mideast,false),
new Question(R.string.question_africa,false),
new Question(R.string.question_americas,true),
new Question(R.string.question_asia,true)
};
private int mCurrentIndex=0;
private boolean mIsCheater;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.d(TAG,"onCreate(Bundle)called");
setContentView(R.layout.activity_quiz);
if(savedInstanceState !=null){
mCurrentIndex = savedInstanceState.getInt(KEY_INDEX,0);
}
mQuestionTextView = (TextView) findViewById(R.id.question_text_view);
mTrueButton = (Button) findViewById(R.id.true_button);
mTrueButton.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
//Toast.makeText(QuizActivity.this,R.string.incorrect_toast,Toast.LENGTH_SHORT).show();
checkAnswer(true);
}
});
mFalseButton = (Button) findViewById(R.id.false_button);
mFalseButton.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
// Toast.makeText(QuizActivity.this,R.string.correct_toast,Toast.LENGTH_SHORT).show();
checkAnswer(false);
}
});
mNextButton = (Button) findViewById(R.id.next_button);
mNextButton.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
mCurrentIndex = (mCurrentIndex+1) % mQuestionBank.length;
mIsCheater = false;
updateQuestion();
}
});
mPrevButton = (Button) findViewById(R.id.prev_button);
mPrevButton.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
mCurrentIndex = (mCurrentIndex-1) % mQuestionBank.length;
updateQuestion();
}
});
mCheatButton = (Button) findViewById(R.id.cheat_button);
mCheatButton.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
//Intent intent = new Intent(QuizActivity.this , CheatActivity.class);
boolean answerIsTrue = mQuestionBank[mCurrentIndex].isAnswerTrue();
Intent intent = CheatActivity.newIntent(QuizActivity.this,answerIsTrue);
//startActivity(intent);
startActivityForResult(intent,REQUEST_CODE_CHEAT);
}
});
updateQuestion();
}
@Override
public void onStart(){
super.onStart();
Log.d(TAG,"onStart() called");
}
@Override
public void onResume(){
super.onResume();
Log.d(TAG,"onResume() called");
}
@Override
public void onPause(){
super.onPause();
Log.d(TAG,"onPause() called");
}
@Override
public void onSaveInstanceState(Bundle savedInstanceState){
super.onSaveInstanceState(savedInstanceState);
Log.i(TAG,"onSaveInstanceState");
savedInstanceState.putInt(KEY_INDEX,mCurrentIndex);
}
@Override
public void onStop(){
super.onStop();
Log.d(TAG,"onStop() called");
}
@Override
public void onDestroy(){
super.onDestroy();
Log.d(TAG,"onDestroy() called");
}
private void updateQuestion(){
int question = mQuestionBank[mCurrentIndex].getTextResId();
mQuestionTextView.setText(question);
}
private void checkAnswer(boolean userPressedTrue){
boolean answerIsTrue = mQuestionBank[mCurrentIndex].isAnswerTrue();
int messageResId = 0;
if(mIsCheater){
messageResId = R.string.judgment_toast;
}else {
if (userPressedTrue == answerIsTrue)
{
messageResId = R.string.correct_toast;
} else {
messageResId = R.string.incorrect_toast;
}
}
Toast.makeText(this,messageResId,Toast.LENGTH_SHORT).show();
}
protected void onActivityResult(int requestCode , int resultCode , Intent data){
if(resultCode != Activity.RESULT_OK){
return;
}
if(requestCode == REQUEST_CODE_CHEAT){
if(data == null){
return;
}
mIsCheater = CheatActivity.wasAnswerShown(data);
}
}
}
strings
<resources>
<string name="app_name">GeoQuiz</string>
<string name="question_australia">堪培拉是澳大利亚的首都 </string>
<string name="question_oceans">太平洋比大西洋大</string>
<string name="question_mideast">苏伊士运河连接着红海和印度洋</string>
<string name="question_africa">尼罗河流域在埃及</string>
<string name="question_americas">亚马逊河是美国最长的河</string>
<string name="question_asia">贝加尔湖是世界上最古老最深的淡水湖</string>
<string name="true_button">TRUE</string>
<string name="false_button">FALSE</string>
<string name="next_button">Next</string>
<string name="prev_button">Prev</string>
<string name="correct_toast">Correct!</string>
<string name="incorrect_toast">Incorrect!</string>
<string name="warning_text">Are you sure you want to do this?</string>
<string name="show_answer_button">Show Answer</string>
<string name="cheat_button">Cheat!</string>
<string name="judgment_toast">Cheating is wrong</string>
</resources>
标签：user 重写 科技 warning 子类 定义 boolean ubi pac
原文地址：http://www.cnblogs.com/xinjin/p/7538413.html
