文件存儲

layout

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="match_parent"android:layout_height="match_parent"><EditTextandroid:id="@+id/edit"android:layout_width="match_parent"android:layout_height="wrap_content"android:hint="Type something here"/></LinearLayout>

main

package demo.jq.com.filepersistencetest;import android.content.Context; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.text.TextUtils; import android.widget.EditText; import android.widget.Toast;import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter;import static java.lang.System.out;/*** @author Jim*/ public class MainActivity extends AppCompatActivity {private EditText edit;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);edit = (EditText) findViewById(R.id.edit);String inputText = load();if (!TextUtils.isEmpty(inputText)) {edit.setText(inputText);edit.setSelection(inputText.length());Toast.makeText(this,"Restoring succeeded",Toast.LENGTH_SHORT).show();}}@Overrideprotected void onDestroy() {super.onDestroy();String inputText = edit.getText().toString();save(inputText);}public void save(String inputText) {FileOutputStream out = null;BufferedWriter writer= null;try {out = openFileOutput("data", Context.MODE_PRIVATE);writer = new BufferedWriter(new OutputStreamWriter(out));writer.write(inputText);} catch (IOException e) {e.printStackTrace();} finally {try {if (writer != null) {writer.close();}} catch (IOException e) {e.printStackTrace();}}}public String load() {FileInputStream in = null;BufferedReader reader = null;StringBuilder content = new StringBuilder();try {in = openFileInput("data");reader = new BufferedReader(new InputStreamReader(in));String line = "";while ((line = reader.readLine()) != null) {content.append(line);}} catch (IOException e) {e.printStackTrace();} finally {try {if (reader != null) {reader.close();}} catch (IOException e) {e.printStackTrace();}}return content.toString();} }

總結

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