在相同活动中使用不同类型的对话框

时间:2013-04-28 21:25:40

标签: java android dialog datepicker alertdialog

首先,我是Android开发的新手,并且大多是全新的编程,所以请耐心等待。我有一个带有几个按钮的Activity。第一个按钮“锻炼名称”打开一个自定义AlertDialog,让我输入一些文本,然后将该文本放在按钮右侧的文本视图中。

我想要第二个按钮,“锻炼日期”,就是在同一活动中打开日期选择器对话框,方式与第一个按钮的工作方式相同。我最终拼凑了正确的代码以使其工作,但在一个不同的活动。所以我真的需要弄清楚如何修改这段代码:

package com.example.test_project;

import java.util.Calendar;

import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;

public class TimePickerFragment extends Activity {
/** Called when the activity is first created. */

   private TextView mDateDisplay;
    private Button mPickDate;
    private int mYear;
    private int mMonth;
    private int mDay;

    static final int DATE_DIALOG_ID = 0;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_new_workout);

    // capture our View elements
    mDateDisplay = (TextView) findViewById(R.id.timeOfWorkoutTextView);
    mPickDate = (Button) findViewById(R.id.dateOfWorkoutButton);

    // add a click listener to the button
    mPickDate.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            showDialog(DATE_DIALOG_ID);
        }
    });

    // get the current date
    final Calendar c = Calendar.getInstance();
    mYear = c.get(Calendar.YEAR);
    mMonth = c.get(Calendar.MONTH);
    mDay = c.get(Calendar.DAY_OF_MONTH);

    // display the current date (this method is below)
    updateDisplay();
}

// updates the date in the TextView
private void updateDisplay() {
        StringBuilder string1 = new StringBuilder()
                // Month is 0 based so add 1
                .append(mMonth + 1).append("-")
                .append(mDay).append("-")
                .append(mYear).append(" ");
    mDateDisplay.setText(string1);
}

// the callback received when the user "sets" the date in the dialog
private DatePickerDialog.OnDateSetListener mDateSetListener =
        new DatePickerDialog.OnDateSetListener() {

            public void onDateSet(DatePicker view, int year,
                                  int monthOfYear, int dayOfMonth) {
                mYear = year;
                mMonth = monthOfYear;
                mDay = dayOfMonth;
                updateDisplay();
            }
        };

@Override
protected Dialog onCreateDialog(int id) {
    switch (id) {
    case DATE_DIALOG_ID:
        return new DatePickerDialog(this, mDateSetListener, mYear, mMonth,
                mDay);
    }
    return null;
}
}

在此代码的timeOfWorkout方法中工作:

package com.example.test_project;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;


public class NewWorkout extends Activity  {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_new_workout);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.new_workout, menu);
    return true;
}

TextView mDateDisplay;
Button mPickDate;
int mYear;
int mMonth;
int mDay;

final int DATE_DIALOG_ID = 0;




public void timeOfWorkout(View view){

    }





public void nameOfWorkout(View view){
    AlertDialog.Builder alert = new AlertDialog.Builder(this);

    alert.setTitle("Enter a Name for This Workout");

    // Set an EditText view to get user input 
    final EditText input = new EditText(this);
    alert.setView(input);

    alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int whichButton) {
      String value = input.getText().toString();
      TextView edit = (TextView) findViewById(R.id.nameOfWorkoutTextView);
      edit.setText(value);
      // Do something with value!
      }
    });

    alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int whichButton) {
        // Canceled.
      }
    });

    alert.show();

}

}

我已经尝试过几个小时修改它,并且总是遇到一个或另一个问题...我很确定我没有足够的Java或Android开发的基本掌握或不同的活动和文件一起工作,使这项工作,所以任何帮助都会得到很大的赞赏!!!

1 个答案:

答案 0 :(得分:0)

在你的一个课程中,你打电话。

showDialog(DATE_DIALOG_ID); 在另一堂课 你打电话 alert.show()

调用.show()可能会有问题(例如,当您的活动在后台时),最好拨打showDialog()

听起来你需要的是两个对话框ID。

protected Dialog onCreateDialog(int id) {
   switch (id) {
   case DATE_DIALOG_ID:
       return new DatePickerDialog(this, mDateSetListener, mYear, mMonth,
            mDay);
   case ALERT_DIALOG_ID:
       // DO YOUR BUILDER STUFF HERE, possibly offload to another method
       // DO NOT call alert.show() instead
       return alert.create()
    }
    return null;
}
}

现在,只要您想显示对话框调用showDialog(DATE_DIALOG_ID);或showDialog(ALERT_DIALOG_ID);`

同时确保DATE_DIALOG_ID与ALERT_DIALOG_ID不同