我正在尝试为我所在的课程创建一个待办事项列表，而我拥有该应用程序的方式是我在顶部有一个 EditText 以在 TDL 中输入一个项目。然后我使用扩展的表格布局来显示项目。我还有一个按钮调用第二个活动，然后有两个其他按钮来获取时间和日期（希望）在我点击按钮上的完成按钮后显示在 TDL 项目上（我想回到主要活动）到目前为止，我正在 AVD 上对此进行测试。
所以我认为我的问题是我不认为我的第二个活动是传回我想要的信息。根据调试器，第一个活动的 onActivityResults 方法在调用第二个活动之前被调用。
这是第一个活动：
package com.parrishb.todo;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.view.KeyEvent;
import android.view.View;
import android.widget.EditText;
import android.widget.Button;
public class ToDoActivity extends Activity {
SharedPreferences pref;
public final static int ACTIVITY =1;
public static Globals g;
public ToDoView tdv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_to_do);
final EditText myEditText = (EditText)findViewById(R.id.myEditText);
Button mPickDate = (Button) findViewById(R.id.pickDate);
tdv = (ToDoView)findViewById(R.id.tdv);
myEditText.setOnKeyListener(new View.OnKeyListener() {
public boolean onKey(View v, int keyCode, KeyEvent event) {
if(event.getAction()== KeyEvent.ACTION_DOWN){
if((keyCode == KeyEvent.KEYCODE_DPAD_CENTER) || (keyCode == KeyEvent.KEYCODE_ENTER)){
tdv.addRow(ToDoActivity.this, myEditText.getText().toString());
myEditText.setText("");
return true;
}
}
return false;
}
});
// CLick listener for the date/time button
mPickDate.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivityForResult(new Intent(ToDoActivity.this, DatePickerActivity.class), ACTIVITY);
}
});
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data){
super.onActivityResult(requestCode, resultCode, data);
if(resultCode== RESULT_OK && requestCode== ACTIVITY){
String append= (new StringBuilder().append(data.getStringExtra("Time"))
.append(" ").append(data.getStringExtra("Date")).toString());
tdv.editRow(ToDoActivity.this, append);
}
}
}
这是我的第二个活动：
package com.parrishb.todo;
import java.util.Calendar;
import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.app.TimePickerDialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;
import android.widget.TimePicker;
public class DatePickerActivity extends Activity {
private TextView mDateDisplay;
private Button mPickDate;
private int mYear;
private int mMonth;
private int mDay;
private TextView mTimeDisplay;
private Button mPickTime;
private Button done;
private int mhour;
private int mminute;
static final int TIME_DIALOG_ID = 1;
static final int DATE_DIALOG_ID = 0;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.buttonclick);
mDateDisplay =(TextView)findViewById(R.id.date);
mPickDate =(Button)findViewById(R.id.datepicker);
mTimeDisplay = (TextView) findViewById(R.id.time);
mPickTime = (Button) findViewById(R.id.timepicker);
done = (Button)findViewById(R.id.done);
//Pick time's click event listener
mPickTime.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
showDialog(TIME_DIALOG_ID);
}
});
//PickDate's click event listener
mPickDate.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
showDialog(DATE_DIALOG_ID);
}
});
done.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//DatePickerActivity.this.finishActivityFromChild(DatePickerActivity.this, ToDoActivity.ACTIVITY);
//finishActivity(ToDoActivity.ACTIVITY);
//return;
//DatePickerActivity.this.finish(ToDoActivity.ACTIVITY);
//finish();
DatePickerActivity.this.finish();
}
});
final Calendar c = Calendar.getInstance();
mYear = c.get(Calendar.YEAR);
mMonth = c.get(Calendar.MONTH);
mDay = c.get(Calendar.DAY_OF_MONTH);
mhour = c.get(Calendar.HOUR_OF_DAY);
mminute = c.get(Calendar.MINUTE);
}
@Override
public void finish(){
Intent resultIntent = new Intent();
Bundle b = new Bundle();
b.putString("Date", mDateDisplay.getText().toString());
b.putString("Time", mTimeDisplay.getText().toString());
resultIntent.putExtras(b);
setResult(Activity.RESULT_OK, resultIntent);
super.finish();
}
//-------------------------------------------update date----------------------------------------//
private void updateDate() {
mDateDisplay.setText(
new StringBuilder()
// Month is 0 based so add 1
.append(mMonth + 1).append("/")
.append(mDay).append("/")
.append(mYear).append(" "));
}
//-------------------------------------------update time----------------------------------------//
public void updatetime()
{
mTimeDisplay.setText(
new StringBuilder()
.append(pad(mhour)).append(":")
.append(pad(mminute)));
}
private static String pad(int c) {
if (c >= 10)
return String.valueOf(c);
else
return "0" + String.valueOf(c);
}
//Datepicker dialog generation
private DatePickerDialog.OnDateSetListener mDateSetListener =
new DatePickerDialog.OnDateSetListener() {
public void onDateSet(DatePicker view, int year,
int monthOfYear, int dayOfMonth) {
mYear = year;
mMonth = monthOfYear;
mDay = dayOfMonth;
updateDate();
}
};
// Timepicker dialog generation
private TimePickerDialog.OnTimeSetListener mTimeSetListener =
new TimePickerDialog.OnTimeSetListener() {
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
mhour = hourOfDay;
mminute = minute;
updatetime();
}
};
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case DATE_DIALOG_ID:
return new DatePickerDialog(this,
mDateSetListener,
mYear, mMonth, mDay);
case TIME_DIALOG_ID:
return new TimePickerDialog(this,
mTimeSetListener, mhour, mminute, true);
}
return null;
}
}