Question

我正在尝试将按钮连接到文本，基本上每当有人按下按钮时文本都会更改。我写了5个over-riding方法续。在侦听器方法中命名为onClick（View v）。但是当我构建我的应用程序并在我的设备上打开它时，只打印了最后一条消息，我知道这是因为最后的overRiding方法会将其他消息静音，但是如何在每次点击按钮时逐个打印所有消息。

Manifest-Version: 1.0
Created-By: 1.7.0_06 (Oracle Corporation)
Main-Class: com.my.package.fooClass

Answer 1

您可以在变量中维护当前状态，并根据状态设置正确的文本。像，

int currentState = 0;
TextView Text;

public void onCreate(Bundle savedInstanceState) {
    Button new_button = (Button) findViewById(R.id.Button);

    Text = (TextView) findViewById(R.id.Text);

    //now we gotta set up the event listener
    new_button.setOnClickListener(
        //here we will put call back method,
        //after someone click the button
        //this methods's body get's executed
        //this is interface
        new Button.OnClickListener(){
            public void onClick(View v){
                if (currentState == 0) {
                    Text.setText("YOU PRESSED IT!");
                    currentState++;
                } else if (currentState == 1) {
                    Text.setText("Please don't press it again :)");
                    currentState++;
                }
                ... and so on ...
            }
        }
    );

Answer 2

你走了！不要忘记在下面的文件中编辑YOUR_PROJECT。

您的Java文件：

package YOUR_PROJECT;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import static YOUR_PROJECT.R.*;

public class Test extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(layout.activity_test);
    Button new_button = (Button) findViewById(R.id.Button);
    new_button.setOnClickListener(new View.OnClickListener() {
        int i = 0;
        TextView Text = (TextView) findViewById(R.id.Text);
        @Override
        public void onClick(View arg0) {

            if (i == 0) {
                Text.setText("YOU PRESSED IT!");
                i++;
            } else {
                if (i == 1) {
                    Text.setText("Please don't press it again :)");
                    i++;
                } else {
                    if (i == 2) {
                        Text.setText("Please Stop It!");
                        i++;
                    } else {
                        if (i == 3) {
                            Text.setText("Stop Pressssssing It");
                            i++;
                        } else {
                            if (i == 4) {
                                Text.setText("You Pressed it again! >:{");
                            } else
                                i = 0;
                        }
                    }
                }
            }
        }
        });
 }
}

您的XML：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="YOUR_PROJECT.Test">

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Button"
    android:id="@+id/Button"
    android:layout_marginTop="101dp"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true" />

<EditText
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/Text"
    android:layout_below="@+id/Button"
    android:layout_alignEnd="@+id/Button"
    android:layout_marginTop="125dp" />
</RelativeLayout>

onClick（）的多个重写方法

2 个答案: