Question

当我点击某个特定按钮时，按钮背景的颜色会改变，而其他按钮保持其默认颜色。但是，在运行应用程序时，虽然代码中的其余逻辑运行良好，但按钮不会更改其颜色。我仍然无法弄清楚出了什么问题。任何帮助将不胜感激。感谢。

  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.timer_test);

  adult = (Button) findViewById(R.id.btnAdult);
    peer = (Button) findViewById(R.id.btnPeer);
    material = (Button) findViewById(R.id.btnMaterial);
    physical = (Button) findViewById(R.id.btnPhysical);


    //Set button disabled, when new activity is turned on

    flag.setEnabled(false);
    alarm = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);

    ...

OnClickListener codes :

if (textDemo.getText().toString() == "Record") {
View.OnClickListener listener = new View.OnClickListener() {
@Override
  public void onClick(View v) {

  if (v.equals(physical)) {
               // do something
              physical.setText("PHYSICAL ON CLICK WORKS");
              physicalPrompt = "Yes";
              physical.setBackgroundColor(getResources().getColor(R.color.buttonPressed));
              adult.setBackgroundResource(R.drawable.button_selector);
              peer.setBackgroundResource(R.drawable.button_selector);
              material.setBackgroundResource(R.drawable.button_selector);
 }

   else if (v.equals(material)) {
               // do something
               material.setText("MATERIAL ON CLICK WORKS");
               materials = "Yes";
               material.setBackgroundColor(getResources().getColor(R.color.buttonPressed));
               peer.setBackgroundResource(R.drawable.button_selector);
                adult.setBackgroundResource(R.drawable.button_selector);
                physical.setBackgroundResource(R.drawable.button_selector);
  }

    else if (v.equals(peer)){
                peer.setText("PEER ON CLICK WORKS");
                peers = "Yes";
                peer.setBackgroundColor(getResources().getColor(R.color.buttonPressed));
                physical.setBackgroundResource(R.drawable.button_selector);
                adult.setBackgroundResource(R.drawable.button_selector);
                material.setBackgroundResource(R.drawable.button_selector);

 }

    else if (v.equals(adult)){
                 adult.setText("ADULT ON CLICK WORKS");
                 peers = "Yes";
                 peer.setBackgroundColor(getResources().getColor(R.color.buttonPressed));
                 physical.setBackgroundResource(R.drawable.button_selector);
                 adult.setBackgroundResource(R.drawable.button_selector);
                 material.setBackgroundResource(R.drawable.button_selector);

 }

    else {
                // do something else
                textDemo.setText("Error!");
         }
    }
   };

   physical.setOnClickListener(listener);
   material.setOnClickListener(listener);
   peer.setOnClickListener(listener);
   adult.setOnClickListener(listener);
   }
  }
 }

在value / colors.xml中，

<?xml version="1.0" encoding="utf-8"?>
<resources>

<color name="buttonNotPressed">#2196F3</color>
<color name="buttonPressed">#1976D2</color>

<!--<color name="colorHighlightFAB">#B6B6B6</color>-->
<color name="ColorPrimary">#E91E63</color>

</resources>

额外代码：

public class Timer_Test extends ActionBarActivity {

//Declare widgets
Button buttonStart, flag, back, timeButton, adult, peer, material, physical;
TextView timerTextView, tvTest, interval, child, status, id, session,  
passName, tvStartTime, textDemo;

Answer 1

首先尝试此解决方案并让我知道它是否正常工作 -

private View.OnClickListener mFirstListener = new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        v.setBackgroundResource(R.color.red);
        ((Button)v).setText("New Text");
    }
};

private View.OnClickListener mSecondListener = new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        v.setBackgroundResource(R.color.blue);
        ((Button)v).setText("New Text");
    }
};

private View.OnClickListener mThirdListener = new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        v.setBackgroundResource(R.color.green);
        ((Button)v).setText("New Text");
    }
};

private View.OnClickListener mFourthListener = new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        v.setBackgroundResource(R.color.light_blue);
        ((Button)v).setText("New Text");
    }
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Button button1 = (Button) findViewById(R.id.button);
    Button button2 = (Button) findViewById(R.id.button2);
    Button button3 = (Button) findViewById(R.id.button3);
    Button button4 = (Button) findViewById(R.id.button4);

    button1.setOnClickListener(mFirstListener);
    button2.setOnClickListener(mSecondListener);
    button3.setOnClickListener(mThirdListener);
    button4.setOnClickListener(mFourthListener);
}

推荐方式（仅限使用XML） -

在drawable文件夹中创建一个名为button_states的文件，并将以下代码放在 -

中

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true" android:drawable="@color/buttonPressed" /> <!--Pressed State-->
    <item android:state_focused="true" android:drawable="@color/buttonPressed" /> <!--Focused State-->
    <item android:drawable="@color/grey" /> <!--Normal State-->
</selector>

现在在您的xml中设置按钮背景，如下所示 -

<Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Button"
        android:id="@+id/button"
        android:padding="10dp"
        **android:background="@drawable/button_states"**
        android:layout_below="@+id/textView"
        android:layout_toEndOf="@+id/textView"
        android:layout_marginStart="42dp"/>

然后你根本不需要改变代码中的颜色，它会对你有用。

如果你使用推荐的方式摆脱所有听众的这一行 - v.setBackgroundResource(R.color.blue);但是对于文本更改，你仍然需要保留以下行((Button)v).setText("New Text");。

希望它有所帮助。

Answer 2

我没有工作，因为我设置了exitFadeDuration和enterFadeDuration：

<selector xmlns:android="http://schemas.android.com/apk/res/android"
    android:exitFadeDuration="40"
    android:enterFadeDuration="120">

删除后，一切都很好！

Answer 3

按钮比仅改变一种颜色更复杂......

Android按钮是使用相当多的9个补丁和状态drawables制作的。只是尝试设置背景颜色可能不会重置以前设置的资源样式。尝试使用更改的背景颜色创建另一个状态可绘制资源，并将其指定给按钮。

Android按钮在点击时不会改变颜色

3 个答案: