android - 无法解析符号 FragmentActivity

Question

Activity 在导入 FragmentActivity 时显示错误。

  import android.support.v4.app.FragmentActivity;
  import android.text.TextUtils;
  import android.widget.TextView;
  import java.util.ArrayList;

public class DetailActivity extends FragmentActivity 

我的build.gradle文件

    apply plugin: 'android'

 android {
compileSdkVersion 23
buildToolsVersion '23.0.3'

defaultConfig {
    minSdkVersion 8
    targetSdkVersion 23
    versionCode 3
    versionName "1.0.2"
    }
    buildTypes {
        release {
            minifyEnabled false

            proguardFiles getDefaultProguardFile('proguard-android.txt'),     'proguard-rules.txt'

        }
        }
    }

dependencies {
    compile 'com.android.support:support-v4:23.1.0'
    compile 'com.android.support:appcompat-v7:23.1.0'
    compile fileTree(include: ['*.jar'], dir: 'libs')

    compile 'com.google.android:support-v4:r7'
}

Answer 1

起初

删除不需要的

compile 'com.google.android:support-v4:r7' // No Need

然后Clean-Rebuild and Do Gradle你的项目