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關(guān)于Android“外部存儲(chǔ)用戶信息”代碼注釋，請(qǐng)問(wèn)有知道的嗎？

Android

慕尼黑8549860 2022-06-01 11:07:33

public void onClick(View v) {File sdPath = Environment.getExternalStorageDirectory();File f = new File(sdPath, "data.txt");switch (v.getId()) {case R.id.btn_save:FileOutputStream fos;String saveinfo = et_info.getText().toString();try {fos = new FileOutputStream(f);fos.write(saveinfo.getBytes());fos.close();} catch (Exception e) {e.printStackTrace();}Toast.makeText(MainActivity.this, "數(shù)據(jù)保存成功", 0).show();break;case R.id.btn_read:String content = "";try {FileInputStream fis = new FileInputStream(f);byte[] buffer = new byte[fis.available()];fis.read(buffer);content = new String(buffer);fis.close();// BufferedReader br = new BufferedReader(new InputStream(fis)));// br.readLine();} catch (Exception e) {e.printStackTrace();}Toast.makeText(MainActivity.this, "保存的數(shù)據(jù)是：" + content, 0).show();break;default:break;}}

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1 回答

慕田峪7331174

TA貢獻(xiàn)1828條經(jīng)驗(yàn) 獲得超13個(gè)贊

public void onClick(View v) {
//獲取產(chǎn)生點(diǎn)擊事件的View的ID
switch (v.getId()) {
case R.id.btn_save://當(dāng)ID為保存按鈕的ID
//獲取EditText中的內(nèi)容（去除空格）
String saveinfo = et_info.getText().toString().trim();
FileOutputStream fos;
try {
//將內(nèi)容寫(xiě)入data.txt中，模式是寫(xiě)在原內(nèi)容尾處。
fos = openFileOutput("data.txt", Context.MODE_APPEND);
//saveinfo 轉(zhuǎn)化為字節(jié)流并通過(guò)fos寫(xiě)入對(duì)應(yīng)文件中
fos.write(saveinfo.getBytes());
fos.close();//關(guān)流
} catch (Exception e) {
e.printStackTrace();
}
//在屏幕上產(chǎn)生Toast
Toast.makeText(MainActivity.this, "數(shù)據(jù)保存成功", 0).show();
break;
case R.id.btn_read://當(dāng)ID為讀按鈕的ID時(shí)
String content = "";//初始化content
try {
//創(chuàng)建文件讀取流
FileInputStream fis = openFileInput("data.txt");
byte[] buffer = new byte[fis.available()];//新建byte數(shù)組，并設(shè)置大小。
fis.read(buffer);//通過(guò)流寫(xiě)入數(shù)組
content = new String(buffer);//給content初始化賦值
} catch (Exception e) {
e.printStackTrace();
}
Toast.makeText(MainActivity.this, "保存的數(shù)據(jù)是：" + content, 0)
.show();
break;
default://以后ID都不是時(shí)，不采取操作。
break;
}
}