我想在片段对话框中显示饼图..
这是代码： -
MainActivity.java
public class MainActivity extends Activity implements
MyDialogFragment.Communicator {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@SuppressLint("NewApi")
public void showDialog(View view) {
FragmentManager manager = getFragmentManager();
MyDialogFragment1 mydialog = new MyDialogFragment1();
mydialog.show(manager, "mydialog");
}
@Override
public void message(String data) {
Toast.makeText(getApplicationContext(), data + " button clicked",
Toast.LENGTH_SHORT).show();
}
}
和 MyDialogFragment1.java
@SuppressLint({ "NewApi", "InflateParams" })
public class MyDialogFragment1 extends DialogFragment implements OnClickListener {
Button no_button;
Context context;
private static int[] COLORS = new int[] { Color.MAGENTA, Color.CYAN };
private static String[] NAME_LIST = new String[] { "A", "B" };
private CategorySeries mSeries = new CategorySeries("");
private DefaultRenderer mRenderer = new DefaultRenderer();
private GraphicalView mChartView;
private int[] VALUES = { 40, 60 };
Communicator communicator;
@SuppressLint("NewApi")
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
if (activity instanceof Communicator) {
communicator = (Communicator) getActivity();
} else {
throw new ClassCastException(activity.toString()
+ " must implemenet MyListFragment.communicator");
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
setCancelable(false);
getDialog().setTitle("Title");
// View view = inflater.inflate(R.layout.main, null, false);
View view = (LinearLayout) inflater.inflate(R.layout.main,container, false);
mRenderer.setApplyBackgroundColor(true);
mRenderer.setBackgroundColor(Color.argb(100, 50, 50, 50));
mRenderer.setChartTitleTextSize(20);
mRenderer.setLabelsTextSize(15);
mRenderer.setLegendTextSize(15);
mRenderer.setMargins(new int[] { 20, 30, 15, 0 });
mRenderer.setZoomButtonsVisible(true);
mRenderer.setStartAngle(90);
for (int i = 0; i < VALUES.length; i++) {
//mSeries.add(NAME_LIST[i] + " " + VALUES[i], VALUES[i]);
mSeries.add(NAME_LIST[i] + "(" + VALUES[i]+"%)", VALUES[i]);
SimpleSeriesRenderer renderer = new SimpleSeriesRenderer();
renderer.setColor(COLORS[(mSeries.getItemCount() - 1) % COLORS.length]);
mRenderer.addSeriesRenderer(renderer);
}
if (mChartView != null) {
mChartView.repaint();
}
//yes_button = (Button) view.findViewById(R.id.yesbtn);
no_button = (Button) view.findViewById(R.id.nobtn);
// setting onclick listener for buttons
// yes_button.setOnClickListener(this);
no_button.setOnClickListener(this);
return view;
}
@SuppressLint("ShowToast")
@Override
public void onResume() {
super.onResume();
if (mChartView == null) {
LinearLayout layout = (LinearLayout) findViewById(R.id.chart);
mChartView = ChartFactory.getPieChartView(context, mSeries, mRenderer ) ;
mRenderer.setClickEnabled(true);
mRenderer.setSelectableBuffer(10);
mChartView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
SeriesSelection seriesSelection = mChartView.getCurrentSeriesAndPoint();
}
});
mChartView.setOnLongClickListener(new View.OnLongClickListener() {
@SuppressLint("ShowToast")
@Override
public boolean onLongClick(View v) {
SeriesSelection seriesSelection = mChartView.getCurrentSeriesAndPoint();
return false;
}
});
layout.addView(mChartView, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
}
else {
mChartView.repaint();
}
}
private LinearLayout findViewById(int chart) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.nobtn :
dismiss();
communicator.message("Dialog No btn clicked");
break;
}
}
public interface Communicator {
public void message(String data);
}
}
和xml文件是： - 的 activity_main.xml中
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="20dp" >
<Button
android:id="@+id/button1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:onClick="showDialog"
android:text="Show Dialog" />
</LinearLayout>
和 main.xml 是： -
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<LinearLayout
android:id="@+id/chart"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="horizontal" >
</LinearLayout>
<Button
android:id="@+id/nobtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/yesbtn"
android:layout_alignBottom="@+id/yesbtn"
android:layout_alignRight="@+id/textView1"
android:layout_marginRight="38dp"
android:text="No" />
</LinearLayout>
现在，当我运行这个程序时，它会显示按钮，当我点击按钮时它会停止... 并显示以下错误： -
FATAL EXCEPTION: main
Process: com.emple.dialog_android_example, PID: 21181
java.lang.ClassCastException: com.emple.dialog_android_example.MainActivity@41ef95b0 must implemenet MyListFragment.communicator
at com.emple.dialog_android_example.MyDialogFragment1.onAttach(MyDialogFragment1.java:64)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:849)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1062)
at android.app.BackStackRecord.run(BackStackRecord.java:698)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1447)
at android.app.FragmentManagerImpl$1.run(FragmentManager.java:443)
at android.os.Handler.handleCallback(Handler.java:808)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5324)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
at dalvik.system.NativeStart.main(Native Method)
问题在哪里????
答案 0 :(得分：0)
我认为您的活动不是Communicator
点击此处：
@SuppressLint("NewApi")
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
if (activity instanceof Communicator) {
communicator = (Communicator) getActivity();
} else {
throw new ClassCastException(activity.toString()
+ " must implemenet MyListFragment.communicator");
}
}