【Android】不同App之间通过SharedPreference共享数据

Android中不同App之间共享数据可以用SharedPreference、ContentProvider,也可以通过sharedUserId。

今天具体来说下怎么通过SharedPreference(以下简称SP)在不同App之间共享数据。

比如SharedApp是共享数据的App,ReceiverApp是来接收数据的App;SharedApp中创建一个SP1,把共享数据存进去;在ReceiverApp中创建一个SP2(需要用到SharedApp的包名),这个SP2就包含共享数据。

关键代码:

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Context sharedAppContext = null;
try {
sharedAppContext = createPackageContext("com.clipperl.sharedpreferenceprovider2", 0);
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
}

以上代码就是通过SharedApp的包名拿到SharedApp中的SP的数据。

接下来把全部代码展示出来。

SharedApp的Activity:

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package com.clipperl.sharedpreferenceprovider2;

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

public class MainActivity extends AppCompatActivity {

public static final String PREFS_READ = "PREFS_READ";
public static final String KEY_READ = "KEY_READ";
private SharedPreferences sharedPreferences;

EditText etShare;
Button btnShare;

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

etShare = (EditText) findViewById(R.id.et_share);
btnShare = (Button) findViewById(R.id.btn_share);
btnShare.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
sharedPreferences = getSharedPreferences(PREFS_READ, MODE_WORLD_READABLE);
SharedPreferences.Editor prefsReadEditor = sharedPreferences.edit();
prefsReadEditor.putString(KEY_READ, String.valueOf(etShare.getText()));
prefsReadEditor.commit();
}
});
}
}

它的布局:

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:id="@+id/activity_main"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<EditText
android:id="@+id/et_share"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="请输入可读数据"/>

<Button
android:id="@+id/btn_share"
android:text="分享可读数据"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>

接下来是ReceiverApp的Activity:

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package com.clipperl.sharedpreferencereceiver2;

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

public class MainActivity extends AppCompatActivity {

public static final String PREFS_READ = "PREFS_READ";
public static final String KEY_READ = "KEY_READ";

private SharedPreferences sharedPreferences;

private EditText etReceiver;
private Button btnReceiver;

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

etReceiver = (EditText) findViewById(R.id.et_receiver);
btnReceiver = (Button) findViewById(R.id.btn_receiver);
btnReceiver.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Context sharedAppContext = null;
try {
sharedAppContext = createPackageContext("com.clipperl.sharedpreferenceprovider2", 0);
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
}
sharedPreferences = sharedAppContext.getSharedPreferences(PREFS_READ, MODE_WORLD_READABLE);
etReceiver.setText(sharedPreferences.getString(KEY_READ, "读取失败"));
sharedPreferences = null;
}
});
}
}

它对应的布局:

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:id="@+id/activity_main"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<EditText
android:id="@+id/et_receiver"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="接收其他app的数据"/>

<Button
android:id="@+id/btn_receiver"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="接收其他app的数据"/>

</LinearLayout>

操作方法:
1、在SharedApp中的EditText中输入数据,点击Button保存到SP中;
2、在ReceiverApp中点击Button,拿到SP中保存的数据,并展示在EditText中。