我使用自己的布局xml更新了警告对话框格式。
在这个定制的警告对话框中有2个按钮，一个按钮用于保存正在输入的数据，另一个按钮用于取消按钮。
我如何为CANCEL按钮编写，以便当用户点击它时，只是简单地放弃对话框？
public OnClickListener NewRowButtonListener = new OnClickListener()
{
@Override
public void onClick(View v)
{
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setView(getLayoutInflater().inflate(R.layout.custom_dialog_add, null));
builder.create();
AlertDialog Custom_dialog_add = builder.create();
Custom_dialog_add.show(); // show the Dialog
Button CancelButton = (Button) findViewById(R.id.CancelButton);
CancelButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {Custom_dialog_add.cancel();} //WRONG: Cannot refer to a non-final variable Custom_dialog_add inside an inner class defined in a different method
});
}
};
现在修改如下：
public OnClickListener NewRowButtonListener = new OnClickListener()
{
@Override
public void onClick(View v)
{
AlertDialog.Builder dialog = new AlertDialog.Builder(MainActivity.this);
dialog.setView(getLayoutInflater().inflate(R.layout.custom_dialog_add, null));
dialog.create();
final AlertDialog test = dialog.create();
test.show();
Button close = (Button) findViewById(R.id.CancelButton);
close.setOnClickListener(new android.view.View.OnClickListener() {
public void onClick(View v) {
test.dismiss();
}
});
}
};
Eclipse没有报告修改过的编码中的错误，但是在模拟时，它会耗尽一个nullpointer异常。 logcat如下。怎么会这样解决？
09-28 20:15:19.505: E/AndroidRuntime(25847): FATAL EXCEPTION: main
09-28 20:15:19.505: E/AndroidRuntime(25847): java.lang.NullPointerException
09-28 20:15:19.505: E/AndroidRuntime(25847): at com.pearappx.gamescore3.MainActivity$4.onClick(MainActivity.java:422)
09-28 20:15:19.505: E/AndroidRuntime(25847): at android.view.View.performClick(View.java:3627)
09-28 20:15:19.505: E/AndroidRuntime(25847): at android.view.View$PerformClick.run(View.java:14329)
09-28 20:15:19.505: E/AndroidRuntime(25847): at android.os.Handler.handleCallback(Handler.java:605)
09-28 20:15:19.505: E/AndroidRuntime(25847): at android.os.Handler.dispatchMessage(Handler.java:92)
09-28 20:15:19.505: E/AndroidRuntime(25847): at android.os.Looper.loop(Looper.java:137)
09-28 20:15:19.505: E/AndroidRuntime(25847): at android.app.ActivityThread.main(ActivityThread.java:4511)
09-28 20:15:19.505: E/AndroidRuntime(25847): at java.lang.reflect.Method.invokeNative(Native Method)
09-28 20:15:19.505: E/AndroidRuntime(25847): at java.lang.reflect.Method.invoke(Method.java:511)
09-28 20:15:19.505: E/AndroidRuntime(25847): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:980)
09-28 20:15:19.505: E/AndroidRuntime(25847): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:747)
09-28 20:15:19.505: E/AndroidRuntime(25847): at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：2)
此代码段会帮助您吗？
LayoutInflater inflater = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.custom_layout, null);
AlertDialog.Builder dialog = new AlertDialog.Builder(this);
dialog.setTitle("dialog");
dialog.setView(view);
final AlertDialog test = dialog.create();
Button close = (Button) view.findViewById(R.id.close_button);
close.setOnClickListener(new android.view.View.OnClickListener() {
public void onClick(View v) {
test.dismiss();
}
});
修改更新版本：
//Create new alert dialog
AlertDialog.Builder dialog = new AlertDialog.Builder(this);
//set title
dialog.setTitle("title");
//create the dialog in a final context
final AlertDialog test = dialog.create();
//inflate the custom layout in to a View object
View view = getLayoutInflater().inflate(R.layout.custom_dialog_add, null);
//find the Button object within the inflated view
// ↓↓↓
Button close = (Button) view.findViewById(R.id.CancelButton);
//set the onClickListener
close.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
test.dismiss();
}
});
//show the dialog
test.show();
不要忘记使用正确的进口！
答案 1 :(得分：0)
您是否正在使用单独的活动来将布局设置为对话框或任何其他方式？ 如果您使用单独的活动来实现布局
只需致电
youractivity.this.finish()
在取消按钮onclick事件
中答案 2 :(得分：0)
这里有一个例子：
// creates Dialogs for this Activity
@Override
protected Dialog onCreateDialog(int id) {
final Dialog dialog;
switch(id) {
case DIALOG_REALLY_EXIT_ID:
dialog = new AlertDialog.Builder(this).setMessage(
"Do you really want to exit this activity?")
.setTitle("Exit activity")
.setCancelable(false)
.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
//add your code you would like to be execute when clicking "yes"
//for example the below to exit your activity
//Main.this.finish();
}
})
.setNegativeButton("No",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel(); //to dismiss this dialog
//add any additional things you would like to execute when pressing the no button
}
}).create();
break;
default:
dialog = null;
}
return dialog;
}
答案 3 :(得分：0)
这在对话框{}内（例如：public void Dialog（...）{here ..}
DialogInterface.OnClickListener cancel = new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
1 add = 1.this;
add.finish();
Intent showActivity = new Intent(1.this, 2.class);
1.this.startActivity(showActivity);
}
};
编辑这些：
1 - 您所在的.java文件的名称。
2 - 取消Dialog时要打开/显示的.java类的名称。
然后把这段代码
builder.setNegativeButton("Cancel", cancel);
会发生什么？ 当您单击“取消”按钮时，它将关闭“页面（带对话框）并打开您想要的活动/页面。
或试试这个：dialogo.setNeutralButton("Cancel", null);
答案 4 :(得分：0)
您可以自己创建按钮。在该按钮上设置onClickListener，在onClick（）内部，您可以调用dialog.cancel();来取消对话框。