我正在尝试构建一个类似于计算自行车齿轮(iOS 版本)的 Android 应用程序,将磁带存储在数据库中。当用户用每个链环的齿数填写 editText 时,我想在下一个进行计算的活动中写入这些值,但我得到的只是一个奇怪的行为: - 如果用户选择两个链环,第二个value 没有写在信息 textView 上,但它出现在列上的 textview 中,以显示对应于第三个链环的结果, - 如果用户选择三个链环,则第二个和第三个值以相反的顺序放置,都在信息 textView 和标题中。
一些图片来说明
我的一段代码:
活动一
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
fillSpinner();
button1.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v){
chainring1editText.setBackgroundColor(getResources().getColor(android.R.color.background_light));
chainring2editText.setBackgroundColor(getResources().getColor(android.R.color.black));
chainring3editText.setBackgroundColor(getResources().getColor(android.R.color.black));
chainringCount = "1";
}
});
button2.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v){
chainring1editText.setBackgroundColor(getResources().getColor(android.R.color.background_light));
chainring2editText.setBackgroundColor(getResources().getColor(android.R.color.background_light));
chainring3editText.setBackgroundColor(getResources().getColor(android.R.color.black));
chainringCount = "2";
}
});
button3.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v){
chainring1editText.setBackgroundColor(getResources().getColor(android.R.color.background_light));
chainring2editText.setBackgroundColor(getResources().getColor(android.R.color.background_light));
chainring3editText.setBackgroundColor(getResources().getColor(android.R.color.background_light));
chainringCount= "3";
}
});
//Check if database is empty
if (spinner.getAdapter().getCount()==0){
Intent intent =new Intent (this,AddCassettes.class);
startActivity(intent);
}
}
private void init() {
chainring1editText = (EditText)findViewById(R.id.chainring1editText);
chainring2editText = (EditText)findViewById(R.id.chainring2editText);
chainring3editText = (EditText)findViewById(R.id.chainring3editText);
//force user to select number of chainrings
chainring1editText.setBackgroundColor(getResources().getColor(android.R.color.black));
chainring2editText.setBackgroundColor(getResources().getColor(android.R.color.black));
chainring3editText.setBackgroundColor(getResources().getColor(android.R.color.black));
button1 = (Button)findViewById(R.id.btnBack);
button2 = (Button)findViewById(R.id.btnReset);
button3 = (Button)findViewById(R.id.btnSave);
spinner = (Spinner)findViewById(R.id.picker);
gearInches = (ToggleButton)findViewById(R.id.inches);
rgWheelSize = (RadioGroup)findViewById(R.id.rgWheelsize);
tvWheelsize = (TextView)findViewById(R.id.tvWheelsize);
}
@Override
protected void onResume(){
super.onResume();
fillSpinner();
}
@SuppressWarnings("deprecation")
private void fillSpinner(){
DataBaseHelper databasehelper = new DataBaseHelper(this);
SQLiteDatabase db = databasehelper.getReadableDatabase();
Spinner picker = (Spinner)this.findViewById(R.id.picker);
Cursor cursor = db.rawQuery ("SELECT _id AS _id, dmodel FROM cass",null);
String[] from = new String[] {"dmodel"};
int[] to = new int[] {android.R.id.text1};
mAdapter = new
SimpleCursorAdapter(this,android.R.layout.simple_spinner_dropdown_item,cursor,from,to);
picker.setAdapter(mAdapter);
mAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
picker.setAdapter(mAdapter);
db.close();
}
//private String[] getItems(){
public void getData(){
// retrieve selected cassette to calculate gears
Spinner spinner = (Spinner)this.findViewById(R.id.picker);
selectedCassette = ((Cursor) spinner.getSelectedItem()).getString(1);
//retrieve teeth
teethOne= this.chainring1editText.getText().toString();
teethTwo =this.chainring2editText.getText().toString();
teethThree =this.chainring3editText.getText().toString();
//retrieve wheelsize from radio button
switch (rgWheelSize.getCheckedRadioButtonId())
{
case R.id.r26inches:
wheelsize = "2055";
tvWheelsize.setText(wheelsize + "mm");
break;
case R.id.r275inches:
wheelsize= "2170";
tvWheelsize.setText(wheelsize + "mm");
break;
case R.id.r29inches:
wheelsize = "2285";
tvWheelsize.setText(wheelsize + "mm");
break;
case R.id.rRoad:
wheelsize = "2097";
tvWheelsize.setText(wheelsize + "mm");
break;
}
//get the state from the toggle button
if (gearInches.isChecked()){
inches = "yes";
}else{
inches = "no";
}
}
//MENU
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle item selection
switch (item.getItemId()) {
case R.id.addCassette:
Intent intent =new Intent (this,AddCassettes.class);
startActivity(intent);
return true;
case R.id.deleteCassette:
Intent intentTwo = new Intent (this,EditCassettes.class);
startActivity(intentTwo);
return true;
case R.id.calculateCombinations:
Intent intentThree = new Intent (this,Calculate.class);
getData();
Bundle b = new Bundle();
b.putString("C",selectedCassette);
b.putString("CC",chainringCount);
b.putString("TO", teethOne);
b.putString("TT", teethThree);
b.putString("TH", teethTwo);
b.putString("WH", wheelsize);
b.putString("IN", inches);
b.putString("CC", chainringCount);
intentThree.putExtras(b);
startActivity(intentThree);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
Calculate.java(活动 2)
public class Calculate extends Activity{
private TextView banner;
String bannerText, selCassette,chainringOne, chainringTwo, chainringThree,chainringCount;
int chainrings = 0;
...
TextView[] tvChainringArray = new TextView[3];
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.calculate);
init();
Bundle bundle = getIntent().getExtras();
selCassette = bundle.getString("C");
chainringOne = bundle.getString("TO");
chainringTwo = bundle.getString("TT");
chainringThree = bundle.getString("TH");
chainringCount = bundle.getString("CC");
wheelsize = bundle.getString("WH");
gearInches = bundle.getString("IN");
if(Integer.parseInt(chainringCount) == 1){
bannerText = selCassette + " * " + chainringOne;
banner.setText(bannerText);
}else if (Integer.parseInt(chainringCount)== 2){
bannerText = selCassette + " * " +chainringOne + "/" + chainringTwo;
banner.setText(bannerText);
}else if(Integer.parseInt(chainringCount) == 3){
bannerText = selCassette + " * " + chainringOne + "/" + chainringTwo + "/" + chainringThree;
banner.setText(bannerText);
}
//call method to retrieve data from database
queryDB("selCassette");
//chainring teeth above gears
tvChainringArray[0].setText(chainringOne);
tvChainringArray[1].setText(chainringTwo);
tvChainringArray[2].setText(chainringThree);
}
public void init(){
banner = (TextView)findViewById(R.id.bigBanner);
tvChainringArray[0] = (TextView)findViewById(R.id.tvCh1);
tvChainringArray[1] = (TextView)findViewById(R.id.tvCh2);
tvChainringArray[2] = (TextView)findViewById(R.id.tvCh3);
}
...
计算.xml
<?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:background="#000000"
android:orientation="vertical">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="12dp"
android:background="#C0C0C0"
android:orientation="horizontal" >
<TextView
android:id="@+id/bigBanner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fontFamily="Helvetica"
android:labelFor="11"
android:padding="5dp"
android:text="@string/largeText"
android:textAlignment="textStart"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textSize="18sp" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@+id/textView2" // blank textView to keep tvCh1,2 & in place
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/mediumText"
android:layout_marginBottom="15dp"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/tvCh1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:labelFor="80"
android:text="@string/smallText"
android:textAlignment="center"
android:textAppearance="?android:attr/textAppearanceSmall"
android:width="60dp" />
<TextView
android:id="@+id/tvCh2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:labelFor="81"
android:text="@string/smallText"
android:textAlignment="center"
android:textAppearance="?android:attr/textAppearanceSmall"
android:width="60dp" />
<TextView
android:id="@+id/tvCh3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:labelFor="82"
android:text="@string/smallText"
android:textAlignment="center"
android:textAppearance="?android:attr/textAppearanceSmall"
android:width="60dp" />
</LinearLayout>
...
你能给出解决这种情况的提示吗?