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java - 如何在android中读取txt文件？

问题描述

package com.example.popword;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
import java.io.File;
import java.util.Scanner;

public class ReadText1 extends Activity {
    TextView textview;
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textview = (TextView) findViewById(R.id.textView);
        try (Scanner scanner = new Scanner(new File("C:\\Users\\UOU\\Desktop\\word.txt"))) {
            while (scanner.hasNext()) {
                textview.setText(scanner.nextLine());
            }
        } catch (Exception e) {
            System.err.println("Exception occurred!");
        }
    }
}

==================================================== ================================== 2019-11-13 20:07:44.224 1004-1004/com.example .popword E/cklee: com.example.popword.ReadText1.printStackTrace(ReadText1.java:29) com.example.popword.ReadText1.onCreate(ReadText1.java:22) android.app.Activity.performCreate(Activity.java:第7136章 android.app.Activity.performCreate(Activity.java:7127) android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271) android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893) android.app.ActivityThread。 handleLaunchActivity(ActivityThread.java:3048) android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808) android.os.Handler.dispatchMessage(Handler.java:106) android. os.Looper.loop(Looper.java:193) android.app.ActivityThread.main(ActivityThread.java:6669) java.lang.reflect.Method.invoke(Native Method) com.android.internal.os.RuntimeInit$MethodAndArgsCaller .run(RuntimeInit.java:493) com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)app.ActivityThread.main(ActivityThread.java:6669) java.lang.reflect.Method.invoke(Native Method) com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) com.android.internal .os.ZygoteInit.main(ZygoteInit.java:858)app.ActivityThread.main(ActivityThread.java:6669) java.lang.reflect.Method.invoke(Native Method) com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) com.android.internal .os.ZygoteInit.main(ZygoteInit.java:858)

标签： javaandroid

解决方案

您可以按照以下步骤直接从存储或 SD 卡中读取文件：

1.将这两个权限添加到你的项目清单文件中

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

2.创建以下函数

private void ReadTxtFile(File txtfilepath) {
    if (txtfilepath.exists()) {
        StringBuffer txt = new StringBuffer();
        try {
            BufferedReader br = new BufferedReader(new FileReader(txtfilepath));
            String line;

            while ((line = br.readLine()) != null) {
                txt.append(line);
                txt.append('\n');
            }
            br.close();
        } catch (IOException e) {
            Log.e("Exception:",e.toString());
        }

        Log.e("File Text:",txt.toString());// "txt" variable contian your file text
    }
}

  1. 随时随地调用函数并提供文本文件路径作为函数参数

     ReadTxtFile(new File("/sdcard/Download/sample.txt"));

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