[Android智慧型手機設計_shared preferences：存取偏好檔案的內容]

woff

存取偏好設定檔案的說明如下：

1.呼叫Context的getSharedPreferences()取得SharedPreferences

getSharedPreferences settings=getSharedPreferences(String?name, int mode)

2.呼叫SharedPreferences的edit()以取得SharedPreferences.E

ditor物件，方可編輯內容
settings.edit()
.putString(“key1", stringValue)
.putBoolean(“key2", booleanValue)
.putInt(“key3", intValue)
.commit();
3.呼叫SharedPreferences對應的getter方法取得對應資料
String fileName = settings.getString("key1", default_fileName);
4.呼叫SharedPreferences.Editor的remove()將指定資料移除
settings.edit()
.remove(key1)
.commit();
@@檔案儲存於 data/data/<專案套件名稱>/shared_prefs/prefSet.xml@@


設計ch7_3_sharedpref.java

1. package com.example.ch7_3_sharedpref;
   
2. 
   
3. import android.os.Bundle;
   
4. import android.app.Activity;
   
5. import android.content.SharedPreferences;
   
6. import android.util.Log;
   
7. import android.view.Menu;
   
8. import android.view.View;
   
9. import android.view.View.OnClickListener;
   
10. import android.widget.Button;
    
11. import android.widget.EditText;
    
12. import android.widget.RadioButton;
    
13. import android.widget.Toast;
    
14. 
    
15. public class Ch7_3_SharedPref extends Activity {
    
16. EditText etFile,etSec;
    
17. RadioButton rbYes,rbNo;
    
18. Button btn1,btn2,btn3;
    
19. String prefName="prefSet";
    
20. String defaultName="Image";
    
21. boolean defaultIsAutoFocus=true;
    
22. int defaultSec=10;
    
23. @Override
    
24. protected void onCreate(Bundle savedInstanceState) {
    
25. super.onCreate(savedInstanceState);
    
26. setContentView(R.layout.main);
    
27. 
    
28. etFile=(EditText)findViewById(R.id.editText1);
    
29. etSec=(EditText)findViewById(R.id.editText2);
    
30. rbYes=(RadioButton)findViewById(R.id.radioButton1);
    
31. rbNo=(RadioButton)findViewById(R.id.radioButton2);
    
32. btn1=(Button)findViewById(R.id.button1);
    
33. btn2=(Button)findViewById(R.id.button2);
    
34. btn3=(Button)findViewById(R.id.button3);
    
35. //1.儲存設定
    
36. btn1.setOnClickListener(new OnClickListener(){
    
37. @Override
    
38. public void onClick(View v) {
    
39. SharedPreferences sp=getSharedPreferences(prefName,MODE_PRIVATE);
    
40. String fileName= etFile.getText().toString();
    
41. boolean isAutoFocus=true;
    
42. if(rbYes.isChecked())
    
43. isAutoFocus=true;
    
44. else
    
45. isAutoFocus=false;
    
46. int sec=0;
    
47. try{
    
48. sec=Integer.parseInt(etSec.getText().toString());
    
49. }catch(Exception e){
    
50. Log.d("Ch7_3_SharedPref", "例外發生:"+e.toString());
    
51. Toast.makeText(Ch7_3_SharedPref.this, "請輸入數字", Toast.LENGTH_LONG).show();
    
52. }
    
53. sp.edit()
    
54. .putString("fileName",fileName )
    
55. .putBoolean("isAutoFocus", isAutoFocus)
    
56. .putInt("sec", sec)
    
57. .commit();
    
58. Toast.makeText(Ch7_3_SharedPref.this, "1.儲存設定", Toast.LENGTH_LONG).show();
    
59. }});
    
60. //2.載入設定
    
61. btn2.setOnClickListener(new OnClickListener(){
    
62. 
    
63. @Override
    
64. public void onClick(View v) {
    
65. SharedPreferences sp=getSharedPreferences(prefName,MODE_PRIVATE);
    
66. String fileName=sp.getString("fileName", defaultName);
    
67. etFile.setText(fileName);
    
68. boolean isAutoFocus=sp.getBoolean("isAutoFocus", defaultIsAutoFocus);
    
69. if(isAutoFocus)
    
70. rbYes.setChecked(true);
    
71. else
    
72. rbNo.setChecked(true);
    
73. int sec=sp.getInt("sec", defaultSec);
    
74. etSec.setText(Integer.toString(sec));
    
75. Toast.makeText(Ch7_3_SharedPref.this, "2.載入設定", Toast.LENGTH_LONG).show();
    
76. }});
    
77. //3.回復預設
    
78. btn3.setOnClickListener(new OnClickListener(){
    
79. 
    
80. @Override
    
81. public void onClick(View v) {
    
82. etFile.setText(defaultName);
    
83. if(defaultIsAutoFocus)
    
84. rbYes.setChecked(true);
    
85. else
    
86. rbNo.setChecked(true);
    
87. etSec.setText(Integer.toString(defaultSec));
    
88. Toast.makeText(Ch7_3_SharedPref.this, "3.回復預設", Toast.LENGTH_LONG).show();
    
89. }});
    
90. }
    
91. }

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