我有一个Android应用程序,它只是保存数据并在列表视图中显示它们,非常类似于记事本教程。不幸的是,我的Add活动似乎已经停止了在某个地方工作。当我尝试添加数据并按下确认时,它会重新加载活动(屏幕稍微闪烁),我输入的任何数据都会被清除。我已经确认它没有达到onSaveInstanceState()。我的印象是这个方法在finish()后自动调用,就像我提到的那样,它一次正在工作。也许有人可以发现我在代码中引入错误的地方?我会粘贴我认为相关的部分:
confirmButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
//Verify that fields are filled out
String description = mDescriptionText.getText().toString();
String amount = mAmountText.getText().toString();
if(description.length() == 0 || amount.length() == 0) {
if(description.length() == 0) {
Context context = getApplicationContext();
CharSequence text = "A description is required";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
}
else {
Context context = getApplicationContext();
CharSequence text = "An amount is required";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
}
}
else {
/* Call this to set the result that your activity will return to its caller */
setResult(RESULT_OK);
/* Call this when your activity is done and should be closed. The ActivityResult is propagated back to
whoever launched you via onActivityResult() */
finish();
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
Log.i("expEdit","onSaveInstance State Reached");
super.onSaveInstanceState(outState);
saveState();
outState.putSerializable(EZBudgetDbAdapter.KEY_ROWID, mRowId);
}
private void saveState() {
Log.i("expEdit","saveState Reached");
String description = mDescriptionText.getText().toString();
String amount = mAmountText.getText().toString();
Double dAmount = 0.0;
if(amount != "") {
dAmount = Double.valueOf(amount).doubleValue();
}
if (mRowId == null) {
long id = mExpDbHelper.createExpenditure(description, dAmount);
if (id > 0) {
mRowId = id;
}
if (mSaveDesc.isChecked()) {
// Save the description to the CommonDesc table
mCommDbHelper = new CommonDescDbAdapter(this);
mCommDbHelper.open();
mCommDbHelper.createCommonDesc(description);
}
} else {
mExpDbHelper.updateExpenditure(mRowId, description, dAmount);
if (mSaveDesc.isChecked()) {
// Save the description to the CommonDesc table
mCommDbHelper = new CommonDescDbAdapter(this);
mCommDbHelper.open();
mCommDbHelper.createCommonDesc(description);
}
}
}
答案 0 :(得分:1)
onSaveInstanceState()。请参阅以下onSaveInstanceState
你的代码不干净。永远不要重复代码。你应该使用
Context context = getApplicationContext();
CharSequence text;
int duration = Toast.LENGTH_SHORT;
if(description.length() == 0) {
text = "A description is required";
} else {
text = "An amount is required";
}
Toast toast = Toast.makeText(context, text, duration);
toast.show();