我的活动中收到以下错误消息。当我尝试实例化AlertDialog时会发生这种情况，我在下面提到过。我正在使用AppCompat主题，因此我不确定为什么会出现此错误：
java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
at android.support.v7.app.AppCompatDelegateImplV7.createSubDecor(AppCompatDelegateImplV7.java:343)
at android.support.v7.app.AppCompatDelegateImplV7.ensureSubDecor(AppCompatDelegateImplV7.java:312)
at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:277)
at android.support.v7.app.AppCompatDialog.setContentView(AppCompatDialog.java:80)
at android.support.v7.app.AlertController.installContent(AlertController.java:214)
at android.support.v7.app.AlertDialog.onCreate(AlertDialog.java:257)
at android.app.Dialog.dispatchOnCreate(Dialog.java:397)
at android.app.Dialog.show(Dialog.java:295)
at android.support.v7.app.AlertDialog$Builder.show(AlertDialog.java:953)
at com.troychuinard.fanpolls.NewImageActivity$MyAdapter$1.onClick(NewImageActivity.java:243)
at android.view.View.performClick(View.java:5210)
at android.view.View$PerformClick.run(View.java:21294)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5527)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:730)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620)
但是，我实际上是将主题应用于我的活动：
值-V21
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<item name="android:windowContentTransitions">true</item>
<item name="android:windowAllowEnterTransitionOverlap">true</item>
<item name="android:windowAllowReturnTransitionOverlap">true</item>
<item name="android:windowSharedElementEnterTransition">@android:transition/move</item>
<item name="android:windowSharedElementExitTransition">@android:transition/move</item>
</style>
当我尝试以编程方式实例化TextInputLyout时发生错误：
public class CreateActivity extends AppCompatActivity {
private String mParam1;
private String mParam2;
private Button mAddImageButton;
private ImageView mAddAnswersButton;
private ImageView mImagePreview;
private String mSpinnerPosition;
private EditText mCreatePollQuestion;
private View mRootView;
private TextInputLayout mCreatePollAnswer;
private EditText mCreatePollAnswerEditText;
private TextView mCreatePollAnswerCounter;
private int mNumberOfPollAnswersCreatedByUser;
private ViewGroup mEditTextAnswerLayout;
private FloatingActionButton mSubmitPollCreation;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_create);
mAddImageButton = (Button) findViewById(R.id.add_image_button);
mAddAnswersButton = (ImageView) findViewById(R.id.add_answers_button);
mImagePreview = (ImageView) findViewById(R.id.preview_image);
mCreatePollQuestion = (EditText) findViewById(R.id.create_poll_question_editText);
mCreatePollAnswerCounter = (TextView) findViewById(R.id.create_poll_answer_counter_TextView);
mEditTextAnswerLayout = (ViewGroup) findViewById(R.id.create_poll_questions_answer_layout);
mSubmitPollCreation = (FloatingActionButton) findViewById(R.id.submit_poll_FAB);
mNumberOfPollAnswersCreatedByUser = 2;
mCreatePollAnswerCounter.setText(String.valueOf(mNumberOfPollAnswersCreatedByUser));
for (int i = 0; i < mNumberOfPollAnswersCreatedByUser; i++){
createAnswerChoice(i+1);
}
mAddAnswersButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mNumberOfPollAnswersCreatedByUser++;
if (mNumberOfPollAnswersCreatedByUser > 5){
Toast.makeText(getApplicationContext(), R.string.max_create_answers, Toast.LENGTH_SHORT).show();
return;
}
createAnswerChoice(mNumberOfPollAnswersCreatedByUser);
mCreatePollAnswerCounter.setText(String.valueOf(mNumberOfPollAnswersCreatedByUser));
}
});
mSubmitPollCreation.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mNumberOfPollAnswersCreatedByUser > 5){
mNumberOfPollAnswersCreatedByUser = 5;
}
for (int i = 0; i < mNumberOfPollAnswersCreatedByUser; i++){
EditText editText = (EditText) mEditTextAnswerLayout.findViewWithTag(getResources().getString(R.string.created_answer_editText_id)+String.valueOf(i+1));
String editTextInputForAnswer = String.valueOf(editText.getText());
Toast.makeText(getApplicationContext(),editTextInputForAnswer,Toast.LENGTH_SHORT).show();
}
}
});
mAddImageButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent toImageSearch = new Intent(getApplicationContext(), NewImageActivity.class);
startActivityForResult(toImageSearch, 1);
}
});
}
//programatically create editText based
private void createAnswerChoice(int answerNumber) {
EditText editText = new EditText(getApplicationContext());
editText.setHint(getResources().getString(R.string.answer_text) + " " + answerNumber);
editText.setSingleLine(true);
editText.setImeOptions(EditorInfo.IME_ACTION_DONE);
String editTextID = ((getResources().getString(R.string.created_answer_editText_id))+String.valueOf(answerNumber));
editText.setTag(editTextID);
Toast.makeText(getApplicationContext(), editTextID, Toast.LENGTH_SHORT).show();
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
editText.setLayoutParams(layoutParams);
TextInputLayout newAnswer = new TextInputLayout(getApplicationContext());
newAnswer.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
newAnswer.addView(editText, layoutParams);
mEditTextAnswerLayout.addView(newAnswer);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 1) {
if(resultCode == CreateActivity.RESULT_OK){
String resultURL =data.getStringExtra("result");
mAddImageButton.setVisibility(View.INVISIBLE);
Picasso.with(getApplicationContext())
.load(resultCode)
.into(mImagePreview);
}
if (resultCode == CreateActivity.RESULT_CANCELED) {
//Write your code if there's no result
}
}
}
}
答案 0 :(得分：1)
您正在使用AlertDialog包中的android.suppport.v7.app，这就是您需要将AppCompat主题应用于对话框的原因。