问题描述
我知道有这个文档
http://developer.android.com/reference/android/app/DialogFragment.html#AlertDialog
但作为一个新的 Android/Java 学习者，通过编写一个弹出 2 个选项(是/否)消息的简单警报对话框来理解所涉及的代码量并不容易.
but as a new Android/Java learner it is not easy to understand the amount of code involved from writing a simple alert dialog that pops up with 2 options (yes/no) message.
这是我当前在 MainActivity 文件中的代码:
Here is the code I currently have in my MainActivity file:
final private int RESET_DIALOG = 0;
private OnClickListener resetButtonListener = new OnClickListener() {
@Override
public void onClick(View v) {
showDialog(RESET_DIALOG);
}
};
protected android.app.Dialog onCreateDialog(int id) {
switch(id) {
case RESET_DIALOG:
AlertDialog.Builder builder = new Builder(this);
return builder
.setMessage("Are you sure you want to reset the count?")
.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {
Toast.makeText(MainActivity.this, "Did not reset!", 5).show();
}
})
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {
Toast.makeText(MainActivity.this, "Did Reset!", 5).show();
}
})
.create();
}
return null;
};
这是我尝试按照 android 站点上的说明进行操作的尝试:主活动文件:
This is my attempt to following the instructions on the android site: Main Activity file:
final private int RESET_DIALOG = 0;
private OnClickListener resetButtonListener = new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, MainDialog.class);
startActivity(intent);
}
};
protected android.app.Dialog onCreateDialog(int id) {
switch(id) {
case RESET_DIALOG:
AlertDialog.Builder builder = new Builder(this);
return builder
.setMessage("Are you sure you want to reset the count?")
.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {
Toast.makeText(MainActivity.this, "Did not reset!", 5).show();
}
})
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {
Toast.makeText(MainActivity.this, "Did Reset!", 5).show();
}
})
.create();
}
return null;
};
然后创建了一个 MainDialog 类:(我实际上迷失了如何正确执行或应用它)
Then created a MainDialog class: (I am actually lost in how to do this correctly or apply it)
package com.proteintracker;
import android.support.v4.app.DialogFragment;
public class MainDialog extends DialogFragment {
public static MyAlertDialogFragment newInstance(int title) {
MyAlertDialogFragment frag = new MyAlertDialogFragment();
Bundle args = new Bundle();
args.putInt("title", title);
frag.setArguments(args);
return frag;
}
}
我不确定是否要为片段创建一个新类，以及如何将它应用到活动屏幕中的当前对话框.
I am not sure if I was suppose to create a new class for the fragment and how to apply it to my current dialog in the activity screen.
推荐答案
你可以像这样显示你的DialogFragment:
You can show your DialogFragment like this:
void showDialog() {
DialogFragment newFragment = MyAlertDialogFragment.newInstance(
R.string.alert_dialog_two_buttons_title);
newFragment.show(getFragmentManager(), "dialog");
}
在片段对话框中，您应该覆盖 onCreateDialog 并返回简单的 Dialog 实例，例如 AlertDialog.
In you fragment dialog you should override onCreateDialog and return you instance of simple Dialog, for example AlertDialog.
public static class MyAlertDialogFragment extends DialogFragment {
public static MyAlertDialogFragment newInstance(int title) {
MyAlertDialogFragment frag = new MyAlertDialogFragment();
Bundle args = new Bundle();
args.putInt("title", title);
frag.setArguments(args);
return frag;
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
int title = getArguments().getInt("title");
AlertDialog.Builder builder = new Builder(this);
return builder
.setMessage("Are you sure you want to reset the count?")
.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {
Toast.makeText(MainActivity.this, "Did not reset!", 5).show();
}
})
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {
Toast.makeText(MainActivity.this, "Did Reset!", 5).show();
}
})
.create();
}
}
这篇关于如何使用对话框片段?(不推荐使用showDialog)Android的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！