Question

我正在创建一个由here下载的模拟量表组成的应用程序。当我点击按钮时，针将偏转到该值。但在我的应用程序中，当我启动应用程序针时消失了。当我点击按钮然后针出现并开始偏转，我想在应用程序的开始出现针这是我的java代码：

/*******************************************************************************
 * Copyright (c) 2012 Evelina Vrabie
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
 *******************************************************************************/
package org.codeandmagic.android.gauge.demo;

import java.util.Random;
import org.codeandmagic.android.gauge.GaugeView;
import android.app.Activity;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {

    private GaugeView mGaugeView1;
    Button check;
    private final Random RAND = new Random();

    @Override
    public void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mGaugeView1 = (GaugeView) findViewById(R.id.gauge_view1);
        check = (Button)findViewById(R.id.button1);
    check.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {


            mTimer.start();

        }
    });
    }

    public  final CountDownTimer mTimer = new CountDownTimer(30000, 1000) {

        @Override
        public void onTick(final long millisUntilFinished) {
            mGaugeView1.setTargetValue((float)25.0);
            //mGaugeView2.setTargetValue(RAND.nextInt(101));
        }

        @Override
        public void onFinish() {}
    };
}

这是我的XML代码：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:gauge="http://schemas.android.com/apk/res/org.codeandmagic.android.gauge.demo"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/background"
    android:gravity="center"
    android:orientation="vertical"
    android:padding="20dp" >

    <org.codeandmagic.android.gauge.GaugeView
        android:id="@+id/gauge_view1"
        android:layout_width="match_parent"
        android:layout_height="303dp"
        android:layout_gravity="center" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Check" />

</LinearLayout>

Answer 1

要在应用程序开始时显示针...在onCreate（）方法调用

中

mGaugeView1.setTargetValue(0);

初始化mGaugeView1后

。

如何在活动开始时在android中显示指针

1 个答案: