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当我在 xml 中设置值时，我的进度条不起作用。

首先，当我以编程方式创建实例时：

LinearLayout progressBarLayout = new LinearLayout(activity);
progressBarLayout.setOrientation(LinearLayout.HORIZONTAL);
ProgressBar progressBar = new ProgressBar(activity, null, android.R.attr.progressBarStyleHorizontal);

progressBar.setBackgroundDrawable(activity.getResources().getDrawable(android.R.drawable.progress_horizontal));
final float[] roundedCorners = new float[] { 5, 5, 5, 5, 5, 5, 5, 5 };
ShapeDrawable pgDrawable = new ShapeDrawable(new RectShape());
pgDrawable.getPaint().setColor(Color.parseColor("yellow"));
ClipDrawable progress = new ClipDrawable(pgDrawable, Gravity.LEFT, ClipDrawable.HORIZONTAL);
progressBar.setProgressDrawable(progress);
progressBar.setProgress(activity.getModel().getProgress());
LayoutParams params = new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
progressBar.setLayoutParams(params);
progressBarLayout.addView(progressBar);
bodyLayout.addView(progressBarLayout);

但是当我使用 xml 时：

布局：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:background="@android:color/white"
  android:orientation="vertical"
  android:padding="10dp" >

  <ProgressBar xmlns:android="http://schemas.android.com/apk/res/android"
       android:id="@+id/progressBar"
       style="@android:style/Widget.ProgressBar.Horizontal"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:maxHeight="30dp"
       android:minHeight="30dp"
       android:progressDrawable="@drawable/progressbar_drawable">
  </ProgressBar>
</LinearLayout>

可绘制：

<?xml version="1.0" encoding="UTF-8"?>

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@android:id/background">
        <shape>
            <corners android:radius="5dip" />
            <gradient
                    android:startColor="#ff9d9e9d"
                    android:centerColor="#ff5a5d5a"
                    android:centerY="0.75"
                    android:endColor="#ff747674"
                    android:angle="270"
            />
        </shape>
    </item>

    <item android:id="@android:id/secondaryProgress">
        <clip>
            <shape>
                <corners android:radius="5dip" />
                <gradient
                        android:startColor="#80ffd300"
                        android:centerColor="#80ffb600"
                        android:centerY="0.75"
                        android:endColor="#a0ffcb00"
                        android:angle="270"
                />
            </shape>
        </clip>
    </item>
    <item
        android:id="@android:id/progress"
    >
        <clip>
            <shape>
                <corners
                    android:radius="5dip" />
                <gradient
                    android:startColor="#33FF33"
                    android:endColor="#008000"
                    android:angle="270" />
            </shape>
        </clip>
    </item>

</layer-list>

JAVA代码： 

progressBar = (ProgressBar) findViewById(R.id.progressBar);
progressBar.setProgress(activity.getModel().getProgress());
bodyLayout.addView(progressBarLayout);

这给了我一个例外（黑屏），我不知道为什么。java中的代码在Viewer类中。我有一个活动控制器实例查看器：

public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        Log.i("innnnnnnnnnnnnnnnnnnnnfo", "menu");
        try {
            setContentView(R.layout.progress_layout);
            detector = new SimpleGestureFilter(this, this);
            this.mUser = (MaritacaUser) getIntent().getSerializableExtra(Constants.USER_DATA);
            if (mUser != null) {
                InputStream file = getResources().getAssets().open(Constants.FORM_FILENAME);    
                setModel(new Model(file));
                if (!getModel().isQuestionsEmpty()) {
                    viewer = new Viewer(ControllerActivity.this, getModel()
                            .getCurrentQuestion());
                }
                setContentView(viewer.getView());
            }       
        } catch (Exception e) {
                throw new MaritacaException(e.getMessage());
        }
    }

我认为(ProgressBar) findViewById(R.id.progressBar); 正在返回 null，但在 R 类中显示 ProgressBar。我在此代码上找不到错误，也许我必须在活动中而不是在查看器中实例化 ProgressBar？

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