即使调用setResult,也不会调用onActivityResult

Question

我有一个活动,MainActivity.java里面有片段(ItemFragment.java),片段()有的recyclelerview显示了一些项目.当项目被cliked时,它会ViewActivity.java为结果启动activity().但是,MainActivity.java不调用()中的onActivityResult方法.这是我的代码

ViewHolder类中的OnClick方法,在单击项目时启动新活动

@Override
public void onClick(View v) {
      Intent i;

      // activity is an instance of AppCompatActivity class (MainActivity.java)
      i = new Intent(activity, ViewActivity.class);

      activity.startActivityForResult(i, SyncTask.REQ_CODE);
}

ViewActivity中发送结果的代码

@Override
public boolean onOptionsItemSelected(MenuItem item) {
        ....
        resultData=new Intent();
        resultData.putExtra(SyncTask.KEY_ACTION, action);
        resultData.putExtra(SyncTask.KEY_POSITION, m.getAdapterPosition());


        setResult(Activity.RESULT_OK,resultData);
        finish();

        return true;
}

onActivityResult方法 MainActivity.java

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    int action;
    int[] positions;

    if (requestCode == SyncTask.REQ_CODE) {
        if (resultCode == Activity.RESULT_OK) {
            // Handle action

        }
    }
}

清单文件

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.app"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="14"
    android:targetSdkVersion="21" />
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity android:name=".activity.MainActivity" android:theme="@style/AppTheme.NoActionBar" android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.MAIN"/>
            <category android:name="android.intent.category.LAUNCHER"/>
        </intent-filter>
    </activity>
    <activity android:theme="@style/Theme.AppCompat.Light" android:name=".activity.PreferencesActivity"></activity>
    <activity android:theme="@style/AppTheme.NoActionBar" android:name=".activity.SignInActivity" android:label="@string/sign_in"></activity>
    <activity android:theme="@style/AppTheme.NoActionBar" android:name=".activity.ViewMailActivity"></activity>
</application>

Answer 1

我解决了这个问题.我的请求代码是否定的,根据纪录片,如果请求代码小于0,则不会发送结果.