Question

我有外部包类（我的自定义库），我想包含在项目中。它使用Activity，但会显示错误。

如果我将此命令放在主项目类中，它运行良好......该怎么办？

以下是代码：

package com.__MyDefaultLibrary;

import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.preference.PreferenceManager;
import android.view.View;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.LinearInterpolator;
import android.view.animation.ScaleAnimation;
import android.widget.*;
import java.io.File;
import java.util.Calendar;
//
import android.app.Activity;
import com.oceanesa.samplevideorecorder.R;


public class __MyDefaultFunctions{
    public  android.app.Activity actv1 = android.app.Activity;

    public void Initt(){
        PreferenceManager.setDefaultValues(actv1.getBaseContext(), R.xml.mypreferences, false);
    }

    // ========== MY CUSTOM LIBRARY =============//
    //button find
    public Button fvb(int id) {
        return (Button) actv1.findViewById(id);
    }

    //message show
    public void msg(String text) {
        Toast.makeText(actv1.getApplicationContext(), text, Toast.LENGTH_LONG).show();
    }

    public View.OnClickListener optionsListener2 = new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            Intent i = new Intent(actv1.getBaseContext(), com.__MyDefaultLibrary.__MyDefaultPreferencesInit1.class);
            actv1.startActivity(i);
        }
    };



}

和AndroidManifest.xml：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.oceanesa.samplevideorecorder"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="16"
        android:targetSdkVersion="19" />

    <uses-permission android:name="android.permission.WRITE_INTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.RECORD_AUDIO" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" />
    <uses-feature android:name="android.hardware.camera.autofocus" />
    <uses-feature
        android:name="android.hardware.camera.front"
        android:required="false" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:screenOrientation="landscape"
        android:theme="@style/AppTheme"
        >
        <activity
            android:name="com.oceanesa.samplevideorecorder.VideoCaptureExample"
            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:name="com.__MyDefaultLibrary.__MyDefaultPreferencesInit1"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN_ACTIVITY" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>

    </application>

</manifest>

Answer 1

更新答案只是将上下文传递给类

public class MyClass {

  private static Context mContext;
  private static Activity mActivity;
  public MyClass(Context c) {
     mContext= c;
  }
public MyClass(Activity act) {
     mActivity= act;
  }

  public static void showToastMethod() {
       // then passing context or activity to
        Toast.makeText(mContext, "mymessage ", Toast.LENGTH_SHORT).show();
       // or Toast.makeText(mActivity, "mymessage ", Toast.LENGTH_SHORT).show();
  }

}

Answer 2

最后，我在主题的帮助下开始工作： How to display a Toast message in from a class that doesn't extend Activity

问题出现在我的代码中。根本不需要致电andorid.app。我没有将 Activity 传递给我的外部文件，我无法调用任何内容..

我必须传递这样的活动（来自主项目文件）：

public MyExternalClass myEx = new MyExternalClass(Activity);

需要一些修改...

＆＃34;错误：找不到符号类应用＆＃34;

2 个答案: