我有当前方法，并且 sActivity 有一个我想使用的公共 arrayList。我只是想不通，我的微调器中没有任何值。这个微调器是在另一个活动中，而不是我将项目添加到数组列表的地方。所以也许我必须intent.putExtra("arrayL", savedColors)这样做，以便我必须将 arraylist 发送到这个活动......我不知道只是猜测。任何帮助深表感谢。我已经将一些 ColorSaver 对象硬编码到 arrayList 中，所以我知道其中有值。
private void addColorNames()
{
Spinner colorsSpinner = (Spinner) findViewById(R.id.colorsSpinner);
ArrayAdapter<ColorSaver> dataAdapter
= new ArrayAdapter<ColorSaver>
(RecallActivity.this, android.R.layout.simple_spinner_item, sActivity.savedColors);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
colorsSpinner.setAdapter(dataAdapter);
}//End addColorNames()
public class RecallActivity extends Activity {
ArrayList<String> namesArray = new ArrayList<String>();
SaveActivity sActivity = new SaveActivity();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recall);
// Show the Up button in the action bar.
setupActionBar();
final Intent intent1 = new Intent(this, MainActivity.class);
final Spinner colorList = (Spinner) findViewById(R.id.colorsSpinner);
Button grabButton = (Button) findViewById(R.id.grabButton);
//Load the spinner with the saved colors
addColorNames();
//namesArray.addAll(sActivity.nameArray);
//colorsSpinner.add;
grabButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Perform action on click
//ColorSaver saver = new ColorSaver(colorName, redcolor, greencolor, bluecolor);
//savedColors.add(saver);
//startActivity(intent1);
ColorSaver selectedItem = (ColorSaver) colorList.getSelectedItem();
int redValue, greenValue, blueValue;
String name;
redValue = selectedItem.getRedValue();
greenValue = selectedItem.getGreenValue();
blueValue = selectedItem.getBlueValue();
name = selectedItem.getColorName();
intent1.putExtra("savedRValue", redValue);
intent1.putExtra("savedGValue", greenValue);
intent1.putExtra("savedBValue", blueValue);
intent1.putExtra("savedName", name);
startActivity(intent1);
}//END onClick
});
}
/**
* Set up the {@link android.app.ActionBar}.
*/
private void setupActionBar() {
getActionBar().setDisplayHomeAsUpEnabled(true);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.recall, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// This ID represents the Home or Up button. In the case of this
// activity, the Up button is shown. Use NavUtils to allow users
// to navigate up one level in the application structure. For
// more details, see the Navigation pattern on Android Design:
//
// http://developer.android.com/design/patterns/navigation.html#up-vs-back
//
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}// END onOptionsItemSelected(MenuItem item)
public void addColorNames()
{
Spinner colorsSpinner = (Spinner) findViewById(R.id.colorsSpinner);
ArrayAdapter<ColorSaver> dataAdapter
= new ArrayAdapter<ColorSaver>
(RecallActivity.this, android.R.layout.simple_spinner_item, sActivity.savedColors);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
colorsSpinner.setAdapter(dataAdapter);
}//End addColorNames()
}//结束类
我将项目保存到数组的类是
public class SaveActivity extends Activity {
private static final String TAG = "Save Activity";
public ArrayList<ColorSaver> savedColors = new ArrayList<ColorSaver>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_save);
// Show the Up button in the action bar.
setupActionBar();
final Intent intent1 = new Intent(this, MainActivity.class);
Button saveButton = (Button) findViewById(R.id.saveButton1);
final EditText nameField = (EditText) findViewById(R.id.colorNameField);
final Intent intent = new Intent();
//Making sure the savedColors arrayList has something in it.
ColorSaver temp = new ColorSaver("TestColor", 180, 80, 255);
savedColors.add(temp);
saveButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Perform action on click
int redcolor, greencolor, bluecolor;
redcolor = intent.getIntExtra("RedValue", 255);
greencolor = intent.getIntExtra("GreenValue", 255);
bluecolor = intent.getIntExtra("BlueValue", 255);
String colorName = nameField.getText().toString();
ColorSaver saver = new ColorSaver(colorName, redcolor, greencolor, bluecolor);
savedColors.add(saver);
Log.i(TAG, savedColors.get(savedColors.size()-1).getColorName());
startActivity(intent1);
}
});
}//END OnCreate()
/**
* Set up the {@link android.app.ActionBar}.
*/
private void setupActionBar() {
getActionBar().setDisplayHomeAsUpEnabled(true);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.save, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// This ID represents the Home or Up button. In the case of this
// activity, the Up button is shown. Use NavUtils to allow users
// to navigate up one level in the application structure. For
// more details, see the Navigation pattern on Android Design:
//
// http://developer.android.com/design/patterns/navigation.html#up-vs-back
//
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
}//结束类