我知道有这个文件
http://developer.android.com/reference/android/app/DialogFragment.html#AlertDialog
但是作为一个新的Android / Java学习者,通过编写一个简单的警报对话框可以看到2个选项(是/否)消息弹出的代码量并不容易.
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,"Did Reset!",5).show();
}
})
.create();
}
return null;
};
这是我尝试按照Android网站上的说明进行操作：主要活动文件：
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",5).show();
}
})
.create();
}
return null;
};
然后创建一个MainDialog类：(我实际上失去了如何正确地做这个或应用它)
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;
}
}
我不知道我是否假设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中.
解决方法
您可以像这样显示您的DialogFragment：
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并返回简单对话框的实例,例如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,5).show();
}
})
.setPositiveButton("Yes",new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0,5).show();
}
})
.create();
}
}
