我正在使用AlertDialog.Builder来显示一个提示用户输入密码的对话框,然后我想在偏好中保存该密码,但我无法弄清楚如何从警报对话框中获取结果输入法。
这基本上是我希望能够做到的:
String result;
AlertDialog.Builder b = new AlertDialog.Builder(this);
b.setTitle("Please enter a password");
final EditText input = new EditText(this);
b.setView(input);
b.setPositiveButton("OK", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int whichButton)
{
//I get a compile error here, it wants result to be final.
result = input.getText().toString();
}
});
b.setNegativeButton("CANCEL", null);
b.create().show();
但是,我愿意做showDialog(int);
这样的事情然后使用onCreateDialog(int)
方法并以某种方式设置结果并以其他方法接收它,但我不知道如何去做最后一部分。
答案 0 :(得分:24)
public class MyActivity extends Activity {
private String result;
void showDialog() {
AlertDialog.Builder b = new AlertDialog.Builder(this);
b.setTitle("Please enter a password");
final EditText input = new EditText(this);
b.setView(input);
b.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int whichButton) {
result = input.getText().toString();
}
});
b.setNegativeButton("CANCEL", null);
b.show();
}
}
答案 1 :(得分:3)
简化示例:
public interface TextListener {
void onPositiveResult(CharSequence text);
}
public static AlertDialog getTextDialog(Context ctx,
final TextListener listener) {
View view = LayoutInflater.from(ctx).inflate(R.layout.dialog, null);
final TextView tv = (TextView) view.findViewById(R.id.tv);
AlertDialog.Builder builder = new AlertDialog.Builder(ctx);
builder.setView(view);
//
builder.setPositiveButton(android.R.string.ok, new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
listener.onPositiveResult(tv.getText());
}
});
builder.setNegativeButton(android.R.string.cancel, null);
return builder.create();
}
- 编辑 - 或者你试试这段代码:
public class Main extends Activity {
private Button btn;
private String result;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn = (Button) findViewById(R.id.button1);
btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
showDialog(0);
}
});
}
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case 0:
final EditText input = new EditText(this);
return new AlertDialog.Builder(this)
.setIcon(R.drawable.icon)
.setTitle("Please enter a password")
.setView(input)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
Toast.makeText(getBaseContext(), input.getText().toString(), Toast.LENGTH_SHORT).show();
}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
Toast.makeText(getBaseContext(), "Cancel clicked!", Toast.LENGTH_SHORT).show();
}
}).create();
}
return null;
}
}
答案 2 :(得分:2)
答案 3 :(得分:1)
变量结果,使其成为成员变量,而不是局部变量。通过将“result”作为成员变量,可以在整个活动中访问它(扩展活动的父类)
答案 4 :(得分:1)
弱但快速的解决方案:
声明一个活动级别方法:
TextView lblDiaDestination;
public void dialogReturn(String msg){
lblDiaDestination.setText(msg);
}
并从正按钮点击列表器中调用它:
alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
dialogReturn( input.getText().toString().trim() );
});
您可以在alert.show()之前更改lblDiaDestination值:
lblDiaDestination = myTextView;
alert.show():
答案 5 :(得分:0)
这很长。我希望我的贡献对新来者有用。 我认为回答这个问题的关键是将变量结果声明为活动的成员(让我们称之为 YourActivity )。然后从“onClick”方法内部使用 YourActivity.this.result 来访问此变量。
我编辑@finiteloop代码如下:
public class YourActivity extends Activity {
private String result;
// other activity stuff
void showDialog(){
AlertDialog.Builder b = new AlertDialog.Builder(this);
b.setTitle("Please enter a password");
final EditText input = new EditText(this);
b.setView(input);
b.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int whichButton) {
YourActivity.this.result = input.getText().toString();
}
});
b.setNegativeButton("CANCEL", null);
b.create().show();
}
}