是的,我知道有AlertDialog。但我很惊讶地知道在Android中显示对话框有多么困难(好吧,至少不是程序员友好的)。
我曾经是一名。net开发人员,我想知道在android上是否有类似的功能?
if (MessageBox.Show("Sure?", "", MessageBoxButtons.YesNo) == DialogResult.Yes){
// Do something...
}
是的,我知道有AlertDialog。但我很惊讶地知道在Android中显示对话框有多么困难(好吧,至少不是程序员友好的)。
我曾经是一名。net开发人员,我想知道在android上是否有类似的功能?
if (MessageBox.Show("Sure?", "", MessageBoxButtons.YesNo) == DialogResult.Yes){
// Do something...
}
当前回答
显示对话框匿名作为命令链&没有定义另一个对象:
new AlertDialog.Builder(this).setTitle("Confirm Delete?")
.setMessage("Are you sure?")
.setPositiveButton("YES",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// Perform Action & Dismiss dialog
dialog.dismiss();
}
})
.setNegativeButton("NO", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// Do nothing
dialog.dismiss();
}
})
.create()
.show();
其他回答
这里所有的答案都归结为冗长且不利于读者的代码:这正是提问者试图避免的。对我来说,最简单的方法是在这里使用lambdas:
new AlertDialog.Builder(this)
.setTitle("Are you sure?")
.setMessage("If you go back you will loose any changes.")
.setPositiveButton("Yes", (dialog, which) -> {
doSomething();
dialog.dismiss();
})
.setNegativeButton("No", (dialog, which) -> dialog.dismiss())
.show();
Android中的Lambdas需要retrolambda插件(https://github.com/evant/gradle-retrolambda),但无论如何,它对编写更清晰的代码非常有帮助。
谢谢。我使用API级别2 (Android 1.1),而不是BUTTON_POSITIVE和BUTTON_NEGATIVE,我必须使用BUTTON1和BUTTON2。
1.创建AlertDialog,设置消息、标题和正面、负面按钮:
final AlertDialog alertDialog = new AlertDialog.Builder(this)
.setCancelable(false)
.setTitle("Confirmation")
.setMessage("Do you want to remove this Picture?")
.setPositiveButton("Yes",null)
.setNegativeButton("No",null)
.create();
2.现在在DialogInterface上找到两个按钮,然后单击setOnClickListener():
alertDialog.setOnShowListener(new DialogInterface.OnShowListener() {
@Override
public void onShow(DialogInterface dialogInterface) {
Button yesButton = (alertDialog).getButton(android.app.AlertDialog.BUTTON_POSITIVE);
Button noButton = (alertDialog).getButton(android.app.AlertDialog.BUTTON_NEGATIVE);
yesButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//Now Background Class To Update Operator State
alertDialog.dismiss();
Toast.makeText(GroundEditActivity.this, "Click on Yes", Toast.LENGTH_SHORT).show();
//Do Something here
}
});
noButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
alertDialog.dismiss();
Toast.makeText(GroundEditActivity.this, "Click on No", Toast.LENGTH_SHORT).show();
//Do Some Thing Here
}
});
}
});
3.To 显示警报对话框:
alertDialog.show();
注意:不要忘记AlertDialog的Final Keyword。
试试这个:
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Confirm");
builder.setMessage("Are you sure?");
builder.setPositiveButton("YES", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// Do nothing but close the dialog
dialog.dismiss();
}
});
builder.setNegativeButton("NO", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// Do nothing
dialog.dismiss();
}
});
AlertDialog alert = builder.create();
alert.show();
你可以在Kotlin中轻松完成:
alert("Testing alerts") {
title = "Alert"
yesButton { toast("Yess!!!") }
noButton { }
}.show()