Android：为什么后续代码阻止TextView的.setText（）工作

更新：致电后，我发现该代码updatePercentage阻止.setText正常工作。我已经更新了以下代码，以显示calcAndDisplayResults来自button_Convert的调用以及的代码calcAndDisplayResults。当我删除调用calcAndDisplayResults了.setText前此调用正常工作。为什么以后的代码会阻止以前的代码工作？

我试图更新TextView对象的文本，以.setText()在content_main布局（包括在activity_main布局中）上显示更新的完成百分比值。我通过我编写的名为private的方法更新文本，该方法updatePercentage从按下各种按钮的onClick方法中调用MainActivity。当从内部的某些位置而不是其他位置调用updatePercentage时，.setText工程（即，更新的文本TextView）onClick。具体来说，它在输入onClick方法时起作用，在单击button_3时起作用，但是在单击button_Convert时不起作用（即，不更新的文本TextView）。button_Convert切换案例中的其他方法（在之后调用updatePercentage）可以正常工作。

我搜索了StackOverflow数据库，发现其他人有setText疑问，但似乎都没有一个能解决我遇到的问题。我的开发环境是Android Studio（2.1.2），具有所有已知的相关更新。我在使用AVD设备Galaxy Nexus API 23时遇到问题。我是Android / Java的新手，非常感谢您的帮助。

这是我的代码的相关部分。

MainActivity.java：

...
import android.widget.TextView;
...

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
...
private TextView percentComplete;
...

@Override
protected void onCreate(Bundle savedInstanceState) {
    final String METHOD = "Method: onCreate";
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ...
    percentComplete = (TextView) findViewById(R.id.textView_PercentCompleteValue);
    ...

}

...

@Override
public void onClick(View view) {
    final String METHOD = "Method: onClick";

    currentValue = valueToConvert.getText().toString();

    int progressUpdate = 0;
    updatePercentage(progressUpdate);  //This one works...text updated to 0%

    ArrayList<String> goodWords = new ArrayList<>();

    Results_Adapter resultsAdapter = new Results_Adapter(this, goodWords);
    listResults.setAdapter(resultsAdapter);

    switch (view.getId()) {

        ...

        case R.id.button_3:
            valueToConvert.setText(String.format(Locale.US, "%s%s", currentValue, "3"));

            progressUpdate = 3;
            updatePercentage(progressUpdate);  //This one works...text updated to 3%

            break;

        ...

        case R.id.button_Convert:
            progressUpdate = 20;
            updatePercentage(progressUpdate);  //This one doesn't work...text stays 0% or 3%, depending if I've clicked button_3 first

            calcAndDisplayResults();  //If I remove the call to this method, the code for updatePercentage works ????

            break;
    }
}

private void calcAndDisplayResults (){
    final String METHOD = "Method: calcAndDisplayResults";
    ArrayList<String> goodWords = new ArrayList<>();

    currentValue = valueToConvert.getText().toString();
    goodWords = convertNumbersToWords(currentValue);
    if (goodWords.size() == 0) {
        goodWords.add("<No equivalent words!>");
    }
    Results_Adapter resultsAdapter = new Results_Adapter(this, goodWords);
    listResults.setAdapter(resultsAdapter);
}

private void updatePercentage (int newPercentage){
    final String METHOD = "Method: updatePercentage";
    Log.v(LOG_CLASS, String.format(Locale.US, "%s; newPercentage: %d%%", METHOD, newPercentage));
    this.percentComplete.setText(String.format(Locale.US, "%d%%", newPercentage));
}

activity_main.xml：

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    android:background="@color/md_grey_200"
    tools:context="com.psmithe.combowords.MainActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay"/>

    </android.support.design.widget.AppBarLayout>

    <include layout="@layout/content_main"/>

</android.support.design.widget.CoordinatorLayout>

content_main.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    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"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="com.psmithe.combowords.MainActivity"
    tools:showIn="@layout/activity_main"
    >

    <TextView
        android:id="@+id/textView_CodeToCovert"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="10dp"
        android:layout_marginEnd="50dp"
        android:layout_marginLeft="50dp"
        android:layout_marginRight="50dp"
        android:layout_marginStart="50dp"
        android:background="@drawable/textview_border"
        android:textAlignment="center"
        android:textSize="24sp"/>

    <GridLayout
        android:id="@+id/gridLayout"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/textView_CodeToCovert"
        android:layout_centerHorizontal="true">

        <Button
            android:id="@+id/button_1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="0"
            android:layout_gravity="center"
            android:layout_row="0"
            android:backgroundTint="@color/colorNumberKeys"
            android:clickable="true"
            android:gravity="center_vertical|center_horizontal"
            android:maxWidth="120dp"
            android:minHeight="50dp"
            android:minWidth="90dp"
            android:onClick="onClick"
            android:text="1"
            android:textSize="12sp"/>

        <Button
            android:id="@+id/button_2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="1"
            android:layout_gravity="center"
            android:layout_row="0"
            android:backgroundTint="@color/colorNumberKeys"
            android:clickable="true"
            android:maxWidth="120dp"
            android:minHeight="50dp"
            android:minWidth="90dp"
            android:onClick="onClick"
            android:text="2\n(A B C)"
            android:textSize="12sp"/>

        <Button
            android:id="@+id/button_3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="2"
            android:layout_gravity="center"
            android:layout_row="0"
            android:backgroundTint="@color/colorNumberKeys"
            android:clickable="true"
            android:maxWidth="120dp"
            android:minHeight="50dp"
            android:minWidth="90dp"
            android:onClick="onClick"
            android:text="3\n(D E F)"
            android:textSize="12sp"/>

        ...

        <Button
            android:id="@+id/button_Convert"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:layout_column="0"
            android:layout_columnSpan="100"
            android:layout_row="4"
            android:backgroundTint="@color/colorConvertKey"
            android:clickable="true"
            android:onClick="onClick"
            android:text="Convert To Words"
            android:textColor="@color/abc_primary_text_material_dark"/>

    </GridLayout>

    <LinearLayout
        android:id="@+id/linearLayout_percentComplete"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/gridLayout"
        android:layout_centerHorizontal="true"
        android:gravity="center_horizontal"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textView_percentCompleteLabel"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Percent Complete:"/>

        <TextView
            android:id="@+id/textView_PercentCompleteValue"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:text=""/>
    </LinearLayout>

    <ListView
        android:id="@+id/listView_EquivalentWords"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/linearLayout_percentComplete"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="10dp"
        android:background="@color/colorListViewBackground"/>

</RelativeLayout>