问题描述
共享首选项可在整个应用程序中访问，因此您可以从应用程序中的任何活动中读取它们。
在活动A中存储键/值对：
SharedPreferences settings = getSharedPreferences("mysettings",
Context.MODE_PRIVATE);
SharedPreferences.Editor editor = settings.edit();
editor.putString("mystring", "wahay");
editor.commit();
从另一个活动中读取此值：
SharedPreferences settings = getSharedPreferences("mysettings",
Context.MODE_PRIVATE);
String myString = settings.getString("mystring", "defaultvalue");
您可以在http://developer.android.com/guide/topics/data/data- storage.html#pref中找到更多信息。
解决方法
我在这个.java文件中有一个SharedPreference；在底部，您可以看到我将值保存到SharedPreferences
GB_PREFERENCES_BENCH和GB_PREFERENCES_FLIES。如何在其他活动中使用这些值？请参阅第二个代码示例以了解如何使用它。
package com.creativecoders.gymbuddy;
import com.creativecoders.gymbuddy.R;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.TextView;
public class Benchmark extends Activity {
public static final String GB_PREFERENCES = "Prefs";
public static final String GB_PREFERENCES_BENCH = "Bench";
public static final String GB_PREFERENCES_FLIES = "Flies";
SharedPreferences gBValues;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_benchmark);
gBValues = getSharedPreferences(GB_PREFERENCES,Context.MODE_PRIVATE);
}
public void onStart() {
super.onStart();
findViewById(R.id.button5).setOnClickListener(new handleButton5());
}
class handleButton5 implements OnClickListener {
public void onClick(View v) {
EditText editText1 = (EditText)findViewById(R.id.editText1);
String sWeight = editText1.getText().toString();
final double dWeight = Double.parseDouble(sWeight);
EditText editText2 = (EditText)findViewById(R.id.editText2);
String sPush = editText2.getText().toString();
final double dPush = Double.parseDouble(sPush);
EditText editText3 = (EditText)findViewById(R.id.editText3);
String sSit = editText3.getText().toString();
final double dSit = Double.parseDouble(sSit);
EditText editText4 = (EditText)findViewById(R.id.editText4);
String sPull = editText4.getText().toString();
final double dPull = Double.parseDouble(sPull);
double dBench = (((Math.floor(dWeight*.0664))*10)-10)+dPush;
double dFlies = (Math.floor(((Math.floor(dBench*.6)/10)*10)));
int iBench = (int)dBench;
int iFlies = (int)dFlies;
Editor editor1 = gBValues.edit();
editor1.putInt(GB_PREFERENCES_BENCH,iBench);
editor1.commit();
Editor editor2 = gBValues.edit();
editor2.putInt(GB_PREFERENCES_FLIES,iFlies);
editor2.commit();
}
}
}
这是我要使用的方式；（特别是在on create方法中，将TextView的文本设置为SharePreference中的值）
package com.creativecoders.gymbuddy;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.TextView;
public class Upper100Start extends Activity {
public static final String GB_PREFERENCES = "Prefs";
public static final String GB_PREFERENCES_CURLS = "Curls";
SharedPreferences gBValues;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.upper100start);
if (gBValues.contains(GB_PREFERENCES_CURLS)){
TextView TextView2 = (TextView)findViewById(R.id.textView2);
TextView2.setText(gBValues.getString(GB_PREFERENCES_CURLS,""));
}
}
public void onStart() {
super.onStart();
findViewById(R.id.button2).setOnClickListener(new handleButton2());
findViewById(R.id.button3).setOnClickListener(new handleButton3());
}
class handleButton2 implements OnClickListener {
public void onClick(View v) {
Intent intent = new Intent(Upper100Start.this,Upper101.class);
startActivity(intent);
}
}
class handleButton3 implements OnClickListener {
public void onClick(View v) {
Intent intent = new Intent(Upper100Start.this,Main.class);
startActivity(intent);
}
}
}