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我是创建自定义组件的新手。我正在通过扩展ProgressBar创建自定义进度条。但得到这个例外。

07-07 17:38:00.700: D/AndroidRuntime(3513): Shutting down VM
07-07 17:38:00.700: W/dalvikvm(3513): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
07-07 17:38:00.720: E/AndroidRuntime(3513): FATAL EXCEPTION: main
07-07 17:38:00.720: E/AndroidRuntime(3513): android.view.InflateException: Binary XML file line #7: Error inflating class com.customprogress.TextProgressBar
07-07 17:38:00.720: E/AndroidRuntime(3513):     at android.view.LayoutInflater.createView(LayoutInflater.java:503)
07-07 17:38:00.720: E/AndroidRuntime(3513):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:565)
07-07 17:38:00.720: E/AndroidRuntime(3513):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:618)
07-07 17:38:00.720: E/AndroidRuntime(3513):     at android.view.LayoutInflater.inflate(LayoutInflater.java:407)
07-07 17:38:00.720: E/AndroidRuntime(3513):     at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
07-07 17:38:00.720: E/AndroidRuntime(3513):     at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
07-07 17:38:00.720: E/AndroidRuntime(3513):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:198)
07-07 17:38:00.720: E/AndroidRuntime(3513):     at android.app.Activity.setContentView(Activity.java:1647)
07-07 17:38:00.720: E/AndroidRuntime(3513):     at com.customprogress.TextProgressBar.<init>(TextProgressBar.java:22)
07-07 17:38:00.720: E/AndroidRuntime(3513):     at com.customprogress.Progress$Click.onClick(Progress.java:27)
07-07 17:38:00.720: E/AndroidRuntime(3513):     at android.view.View.performClick(View.java:2408)
07-07 17:38:00.720: E/AndroidRuntime(3513):     at android.view.View$PerformClick.run(View.java:8816)
07-07 17:38:00.720: E/AndroidRuntime(3513):     at android.os.Handler.handleCallback(Handler.java:587)
07-07 17:38:00.720: E/AndroidRuntime(3513):     at android.os.Handler.dispatchMessage(Handler.java:92)
07-07 17:38:00.720: E/AndroidRuntime(3513):     at android.os.Looper.loop(Looper.java:123)
07-07 17:38:00.720: E/AndroidRuntime(3513):     at android.app.ActivityThread.main(ActivityThread.java:4627)
07-07 17:38:00.720: E/AndroidRuntime(3513):     at java.lang.reflect.Method.invokeNative(Native Method)
07-07 17:38:00.720: E/AndroidRuntime(3513):     at java.lang.reflect.Method.invoke(Method.java:521)
07-07 17:38:00.720: E/AndroidRuntime(3513):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
07-07 17:38:00.720: E/AndroidRuntime(3513):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
07-07 17:38:00.720: E/AndroidRuntime(3513):     at dalvik.system.NativeStart.main(Native Method)
07-07 17:38:00.720: E/AndroidRuntime(3513): Caused by: java.lang.NoSuchMethodException: TextProgressBar(Context,AttributeSet)
07-07 17:38:00.720: E/AndroidRuntime(3513):     at java.lang.Class.getMatchingConstructor(Class.java:660)
07-07 17:38:00.720: E/AndroidRuntime(3513):     at java.lang.Class.getConstructor(Class.java:477)
07-07 17:38:00.720: E/AndroidRuntime(3513):     at android.view.LayoutInflater.createView(LayoutInflater.java:475)
07-07 17:38:00.720: E/AndroidRuntime(3513):     ... 20 more

我的创建代码在这里.. TextProgressBar.class

public class TextProgressBar extends ProgressBar {
    Activity activity;


    public TextProgressBar(Activity activity) {
        super(activity);
        this.activity = activity;
        this.activity.setContentView(R.layout.custom_progress);
    }

我从我的 Progress.java 活动中调用这个类

public class Progress extends Activity {
    /** Called when the activity is first created. */
    Button buttonClick;
    TextProgressBar textProgressBar;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        buttonClick = (Button) findViewById(R.id.buttonClick);
        buttonClick.setOnClickListener(new Click());
    }

    class Click implements OnClickListener
    {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            textProgressBar = new TextProgressBar(Progress.this);
        }

    }
}

custom_progress 的 xml 在这里..

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <com.customprogress.TextProgressBar
        android:id="@+id/progressBarWithText"
        android:layout_width="100dp"
        android:layout_height="100dp"
       />

</LinearLayout>

如果有人知道这个的解决方案，请帮助我..提前谢谢..

4

1 回答 1

2

尝试添加第二个构造函数。

public TextProgressBar(Context context, AttributeSet attrs) {
    super(context, attrs); 

}

看看是否有帮助：

于 2012-08-14T06:04:14.757 回答