Question

每次用户点击时，我都会有一个5循环创建一个添加到父视图的textview。但是，如果我连续点击按钮（就像在previos看停止之前那样），那么临时值会超过0到4并继续......如何重置处理程序内的临时值（静态变量）。

      // start of program.
         static int temp = 0;

      // button on click event
         temp = 0;

                        for(k = 0; k < 5; k++){
                          new Handler().postDelayed(new Runnable() {
                                public void run() {  
                                    Animation a1 = new AlphaAnimation(0.00f, 1.00f);
                                    a1.setDuration(350);
                                    a1.setFillAfter(true);  
                                    TextView tv = new TextView(Main.this);  
                                    tv.setVisibility(View.INVISIBLE); 

                                //  tv.setText(emotionnames.get(temp));  //crashing here. index is 5 size is 5


                                    Log.i("temp", Integer.toString(temp));  
                                    tv.setTextSize(32); 
                                    tv.setPadding(10, 0, 10, 0);
                                    tv.clearAnimation();   
                                    tv.startAnimation(a1);
                                    lhsv.addView(tv); 

                                    temp++;
                                }
                            }, 500 + 500 * k);   
                    }

Answer 1

编辑：我修改了我的答案。一般来说，我认为在课堂上添加更多结构与在一个地方完成所有事情是一件好事。其中一个例子可能如下：

public class StackoverflowActivity extends Activity {

    private Button mBtn;
    private LinearLayout mContainer;

    private final Handler mHandler = new Handler()
    {
    public void handleMessage(Message msg)
    {
        int index = msg.what;
        addTextViewAnimated(index);
    }
    };


    // Called when the add-button is clicked
    private OnClickListener myClickListener = new OnClickListener()
    {
        @Override
        public void onClick(View v) {

            // Create 5 textViews
            for(int k=0; k < 5; k++)
            {
                mHandler.sendEmptyMessageDelayed(k, 500 + 500 * k);
            }
        }

    };

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // Container view -> the linearlayout inside a scrollview
        mContainer = (LinearLayout)findViewById(R.id.container);

        // The button to click
        mBtn = (Button)findViewById(R.id.btn);

        // Add the clicklistener
        mBtn.setOnClickListener(myClickListener);

    }

    // This function creates the TextView
    // And adds it to the container Animated
    public void addTextViewAnimated(int index)
    {
        Animation a1 = new AlphaAnimation(0.00f, 1.00f);
        a1.setDuration(350);
        a1.setFillAfter(true);
        TextView tv = new TextView(this);
        tv.setVisibility(View.VISIBLE);

        tv.setTextSize(32);
        tv.setPadding(10, 0, 10, 0);
        tv.clearAnimation();
        tv.startAnimation(a1);
        tv.setText("Textview "  + index);
        mContainer.addView(tv);
    }
}

为了便于使用，这是我的main.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/RelativeLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<Button
    android:id="@+id/btn"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentBottom="true"
    android:layout_centerVertical="true"
    android:text="Button" />

<ScrollView
    android:id="@+id/scrollView1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:fillViewport="true"
    android:layout_above="@id/btn" >

    <LinearLayout
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >
    </LinearLayout>
</ScrollView>

</RelativeLayout>

也许这会让你开始。我不确定，你想要达到什么目的。

如何在android中的post延迟处理程序中重置静态变量

1 个答案: