Question

在我的程序中，我希望它在单击按钮后在屏幕上显示灯光。这可以直接将它放在onCreate上，这样一旦应用程序启动灯亮起，但是当我在onClick中使用相同的方法时，它似乎不起作用。

public class LightFlashGame extends Activity {

public static final int LIGHT_DIAM = 15;

final Lights lightModel = new Lights();

LightFlashView lightView;

private static int light = 0;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    lightView = new LightFlashView(this, lightModel);

    //makeLights(lightModel, lightView, Color.RED); !!!Works when method is called here

    setContentView(R.layout.activity_light_flash_game);
    ((RelativeLayout) findViewById(R.id.root)).addView(lightView, 0);

    ((Button) findViewById(R.id.btnBack)).setOnClickListener(
            new Button.OnClickListener() {
                @Override public void onClick(View v) {
                   Intent backScreen = new Intent(LightFlashGame.this, LightFlashMain.class);
                   startActivity(backScreen);
                } });

    ((Button) findViewById(R.id.btnStart)).setOnClickListener(
            new Button.OnClickListener(){
            @Override public void onClick(View v){
                makeLights(lightModel, lightView, Color.RED); !!!But not here       
                }
            });    
}

/** Install a context menu. */
@Override public void onCreateContextMenu(
    ContextMenu menu,
    View v,
    ContextMenuInfo menuInfo)
{
    super.onCreateContextMenu(menu, v, menuInfo);
}

/** Respond to a context menu selection. */
@Override public boolean onContextItemSelected(MenuItem item) {
    return super.onContextItemSelected(item);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.light_flash_main, menu);
    return true;
}

void makeLights(Lights lights, LightFlashView light, int color){
    lights.addLight(
            LIGHT_DIAM + (75),
            LIGHT_DIAM + (75),
            color,
            LIGHT_DIAM);

}

}

布局

<?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:id="@+id/root"
    android:layout_width="fill_parent"
    android:layout_height="fill_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=".LightFlashGame" >

    <TextView
        android:id="@+id/txtRound"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/btnBack"
        android:text="Round : " 
        android:textStyle="bold"
        />

    <Button
        android:id="@+id/btnStart"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="LightFlash" 
        android:layout_centerHorizontal="true"
        android:layout_alignParentBottom="true"
        />

    <Button
        android:id="@+id/btnBack"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentBottom="true"
        android:text="Back" 
        />

    <TextView
        android:id="@+id/txtScore"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/btnBack"
        android:layout_alignParentRight="true"
        android:text="Score : "
        android:textStyle="bold" />

</RelativeLayout>

Answer 1

您的方法不公开，请将其公开，然后立即尝试访问此内容！

public void makeLights(Lights lights, LightFlashView light, int color){
    lights.addLight(
            LIGHT_DIAM + (75),
            LIGHT_DIAM + (75),
            color,
            LIGHT_DIAM);

}

在您的代码中找不到任何错误，请尝试更改它：

((Button) findViewById(R.id.btnStart)).setOnClickListener(
            new Button.OnClickListener(){
            @Override public void onClick(View v){
                lightView = new LightFlashView(this, lightModel);
                makeLights(lightModel, lightView, Color.RED);

                }
            });

Answer 2

将您对makeLights()中的onClick()的通话更改为以下内容：

@Override
public void onClick(View v)
{
    LightFlashGame.this.makeLights(lightModel, lightView, Color.RED);
}

如何在Android中使我的onClick方法正常工作？

2 个答案: