Android学习笔记 - 对话框(Dialog)

1. 利用AlertDialog物件来显示对话框。

2. MainActivity.java

package org.me.android_dialog;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {
    private Button dialogButton;
    
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        dialogButton = (Button) findViewById(R.id.dialogButton);
        final AlertDialog alertDialog = getAlertDialog("这是一个对话框","请选择......");
        dialogButton.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(final View view) {
                //显示对话框
                alertDialog.show();
            }
        });
    }

    private AlertDialog getAlertDialog(String title,String message){
        //产生一个Builder物件
        Builder builder = new AlertDialog.Builder(MainActivity.this);
        //设定Dialog的标题
        builder.setTitle(title);
        //设定Dialog的内容
        builder.setMessage(message);
        //设定Positive按钮资料
        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                //按下按钮时显示快显
                Toast.makeText(MainActivity.this, "您按下OK按钮", Toast.LENGTH_SHORT).show();
            }
        });
        //设定Negative按钮资料
        builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                //按下按钮时显示快显
                Toast.makeText(MainActivity.this, "您按下Cancel按钮", Toast.LENGTH_SHORT).show();
            }
        });
        //利用Builder物件建立AlertDialog
        return builder.create();
    }
}

3. main.xml(Layout)

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4. 按下ShowDialog按钮之後出现的画面