Android 4.0设置Dialog点击屏幕不消失

业务的需求是变化莫测的，最近就遇到一个需求是——用户只有点击Dialog的取消按钮才会消失，点击屏幕的时候不消失。Android ICS对UI做了很大的变动，系统提倡使用DialogFragment，但是系统默认的操作习惯是点击屏幕Dialog会自动消失。

为了实现业务的需求，想过使用Dialog风格的Activity，但是做出来的效果和系统的UI效果不匹配，最终只有失败告终。在黔驴技穷的时候，决定再仔细撸一下Android文档，终于在文档中发现了Dialog的setCanceledOnTouchOutside属性，具体使用如下：

方法一：

[java] view
plaincopy

public 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;

}



@TargetApi(11)

@Override

public Dialog onCreateDialog(Bundle savedInstanceState) {

int title = getArguments().getInt("title");





AlertDialog dialog = new AlertDialog.Builder(getActivity())

.setIcon(R.drawable.ic_launcher)



.setTitle(title)

.setPositiveButton(R.string.alert_dialog_ok,

new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog, int whichButton) {

((MainActivity)getActivity()).doPositiveClick();

}

}

)

.setNegativeButton(R.string.alert_dialog_cancel,

new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog, int whichButton) {

((MainActivity)getActivity()).doNegativeClick();

}

}

)

.create();

dialog.setCanceledOnTouchOutside(false);// 设置点击屏幕Dialog不消失



return dialog;

}

}

方法二：

在oncreate()方法中设置Dialog点击屏幕不可取消，实例代码如下：

[java] view
plaincopy

@Override

public void onCreate(Bundle icicle)

{

super.onCreate(icicle);

this.setCancelable(false);// 设置点击屏幕Dialog不消失

int style = DialogFragment.STYLE_NORMAL, theme = 0;

setStyle(style,theme);

}

（提示：提醒大家一下在覆写了onCreateDialog()方法后，就不能覆写onCreateView()方法了）

说到这儿就给大家介绍一下创建DialogFragment的第二种方式吧，第一种方式上面已经叙述了，在此就不再叙述了，直接看第二种实现的具体方式，具体代码如下所示：

[java] view
plaincopy

import android.app.Activity;

import android.app.DialogFragment;

import android.app.FragmentTransaction;

import android.content.DialogInterface;

import android.os.Bundle;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;



public class PromptDialogFragment

extends DialogFragment

implements View.OnClickListener

{

private EditText et;



public static PromptDialogFragment

newInstance(String prompt)

{

PromptDialogFragment pdf = new PromptDialogFragment();

Bundle bundle = new Bundle();

bundle.putString("prompt",prompt);

pdf.setArguments(bundle);



return pdf;

}



@Override

public void onAttach(Activity act) {

// If the activity we're being attached to has

// not implemented the OnDialogDoneListener

// interface, the following line will throw a

// ClassCastException. This is the earliest we

// can test if we have a well-behaved activity.

OnDialogDoneListener test = (OnDialogDoneListener)act;

super.onAttach(act);

}



@Override

public void onCreate(Bundle icicle)

{

super.onCreate(icicle);

this.setCancelable(true);

int style = DialogFragment.STYLE_NORMAL, theme = 0;

setStyle(style,theme);

}

// 覆写onCreateView()方法，实现DialogFragment的布局。注意不能同时覆写 onCreateView()和onCreateDialog()方法

public View onCreateView(LayoutInflater inflater,

ViewGroup container,

Bundle icicle)

{

View v = inflater.inflate(

R.layout.prompt_dialog, container, false);



TextView tv = (TextView)v.findViewById(

R.id.promptmessage);

tv.setText(getArguments().getString("prompt"));



Button dismissBtn = (Button)v.findViewById(

R.id.btn_dismiss);

dismissBtn.setOnClickListener(this);



Button saveBtn = (Button)v.findViewById(

R.id.btn_save);

saveBtn.setOnClickListener(this);



Button helpBtn = (Button)v.findViewById(

R.id.btn_help);

helpBtn.setOnClickListener(this);



et = (EditText)v.findViewById(R.id.inputtext);

if(icicle != null)

et.setText(icicle.getCharSequence("input"));

return v;

}



@Override

public void onSaveInstanceState(Bundle icicle) {

icicle.putCharSequence("input", et.getText());

super.onPause();

}



@Override

public void onCancel(DialogInterface di) {

Log.v(MainActivity.LOGTAG, "in onCancel() of PDF");

super.onCancel(di);

}



@Override

public void onDismiss(DialogInterface di) {

Log.v(MainActivity.LOGTAG, "in onDismiss() of PDF");

super.onDismiss(di);

}



public void onClick(View v)

{

OnDialogDoneListener act = (OnDialogDoneListener)getActivity();

if (v.getId() == R.id.btn_save)

{

TextView tv = (TextView)getView().findViewById(R.id.inputtext);

act.onDialogDone(this.getTag(), false, tv.getText());

dismiss();

return;

}

if (v.getId() == R.id.btn_dismiss)

{

act.onDialogDone(this.getTag(), true, null);

dismiss();

return;

}

if (v.getId() == R.id.btn_help)

{

FragmentTransaction ft = getFragmentManager().beginTransaction();

ft.remove(this);



// in this case, we want to show the help text, but

// come back to the previous dialog when we're done

ft.addToBackStack(null);

//null represents no name for the back stack transaction



HelpDialogFragment hdf =

HelpDialogFragment.newInstance(R.string.help1);

hdf.show(ft, MainActivity.HELP_DIALOG_TAG);

return;

}

}

}

代码比较简单，注释已经写明白了，相信大家都能看懂的！

以上只是设置Dialog的一个小技巧以及创建DialogFragment的两种创建方式，希望对大家有所帮助