仅当我从Android Studio中安装Android应用程序时，该应用程序才能运行，而当我直接在其他手机上安装APK时，则无法运行

Question

我是Android开发的新手，正在尝试使用sharedprefernces保存字符串。 当我将手机用作仿真器时，一切正常。 Android Studio在我的手机上安装了该应用程序，并且可以正常运行。

问题是，我使用shareIt将apk文件传输到其他手机，但无法正常工作。 Toast正在运行，但是当我单击“保存”按钮时，应用程序关闭，但不幸地停止了工作。

然后，我使用Android Studio安装了相同的项目，并且该项目正常工作。

我在3种设备上进行了测试，所有问题都相同。 直接使用APK安装时为何不起作用。

这是代码。

MainActivity.java

package geekdashboard.learningtetsing;

import android.content.Context;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    public static final String PREFS_NAME = "PROFILE_CHANGER_KEYWORDS";
    public static final String PREFS_KEY = "silent";
    Context context;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void toastTesting(View view) {

        // Code for Toast
        Toast.makeText(MainActivity.this,
                "Toast is Working :)", Toast.LENGTH_SHORT).show();
        // Toast End
    }


    public void savingValue(View v) {
        // Reading value from name editField
        EditText nameField = (EditText) findViewById(R.id.name);
        String enteredName = nameField.getText().toString();

        if (enteredName.equals("")) {
            Toast.makeText(MainActivity.this,
                    "Empty Keyword Not Allowed", Toast.LENGTH_SHORT).show();
        } else {

            SharedPreferences prefs = this.getSharedPreferences(
                    "com.geekdashboard.learningtetsing", Context.MODE_PRIVATE);
            prefs.edit().putString(PREFS_KEY, enteredName).commit();

            Toast.makeText(MainActivity.this,
                    enteredName + " has been saved to " + PREFS_NAME, Toast.LENGTH_SHORT).show();
        }
    }

    public void showValue(View sv) {

        SharedPreferences prefsread = this.getSharedPreferences(
                "com.geekdashboard.learningtetsing", Context.MODE_PRIVATE);
        String savedValue = prefsread.getString(PREFS_KEY, null);
        Toast.makeText(MainActivity.this,
                savedValue + " is the last saved value in "+ PREFS_NAME, Toast.LENGTH_SHORT).show();
    }

}

activity_main.xml中

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="geekdashboard.learningtetsing.MainActivity">


    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/buttonString"
        android:onClick="toastTesting"
        android:layout_marginTop="10dp"
        android:background="#212121"
        android:textColor="#FFFFFF"
        android:id="@+id/button" />


    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/buttonShared"
        android:background="@color/accent_material_light"
        android:textColor="#FFFFFF"
        android:id="@+id/save"
        android:onClick="savingValue"
        android:layout_below="@+id/name"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="textPersonName"
        android:hint="Enter Your Name Here"
        android:ems="10"
        android:id="@+id/name"
        android:singleLine="true"
        android:layout_below="@+id/button"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="43dp" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/showValue"
        android:id="@+id/show"
        android:layout_centerVertical="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentEnd="true"
        android:background="@android:color/holo_blue_dark"
        android:textColor="#FFFFFF"
        android:onClick="showValue"/>

</RelativeLayout>

表现

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="geekdashboard.learningtetsing">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

手动安装apk文件时，showValue和saveValue方法不起作用。

谢谢

Answer 1

我更改了使用sharedPreferences的方式，并且有效。 这是修改后的代码。

package geekdashboard.learningtetsing;

import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    public static final String PREFS_NAME = "PROFILE_CHANGER_KEYWORDS";
    public static final String PREFS_KEY = "silent";
    Context context;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void toastTesting(View v) {

        // Code for Toast
        Toast.makeText(MainActivity.this,
                "Toast is Working :)", Toast.LENGTH_SHORT).show();
        // Toast End
    }


    public void savingValue(View view) {
        // Reading value from name editField
        EditText nameField = (EditText) findViewById(R.id.name);
        String enteredName = nameField.getText().toString();

        if (enteredName.equals("")) {
            Toast.makeText(MainActivity.this,
                    "Empty Keyword Not Allowed", Toast.LENGTH_SHORT).show();
        } else {

           // Context context = getActivity();
            SharedPreferences sharedPref = this.getPreferences(Context.MODE_PRIVATE);

            //prefs.edit().putString(PREFS_KEY, enteredName).commit();

            SharedPreferences.Editor editor = sharedPref.edit();
            editor.putString(PREFS_KEY, enteredName);
            editor.commit();


            Toast.makeText(MainActivity.this,
                    enteredName + " has been saved to " + PREFS_NAME, Toast.LENGTH_SHORT).show();
        }
    }

    public void showValue(View sv) {

        SharedPreferences sharedPref = this.getPreferences(Context.MODE_PRIVATE);
       String defaultValue = "Silent";
        String savedValue = sharedPref.getString(PREFS_KEY, defaultValue);

        /* SharedPreferences prefsread = this.getSharedPreferences(
                "com.geekdashboard.learningtetsing", Context.MODE_PRIVATE);
        String savedValue = prefsread.getString(PREFS_KEY, null); */
        Toast.makeText(MainActivity.this,
                savedValue + " is the last saved value in "+ PREFS_NAME, Toast.LENGTH_SHORT).show();
    }


}

Answer 2

是ProGuard配置错误。