Android:读取Assets文件和raw文件

一、读取Assets文件

Assets文件不能用R.xxx.XXX调用

1.新建assets目录，并在目录中建一个txt文件

新建assets

新建txt文件

2.读取该文件数据

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="zs.readassetsdemo.MainActivity">

    <Button
        android:id="@+id/read_txt"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="读取txt"/>

</LinearLayout>

MainActivity.java

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "ReadAssets";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        findViewById(R.id.read_txt).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try {
                    //通过输入流获取文件信息
                    InputStream is = getResources().getAssets().open("test.txt");
                    //把输入流转换为字符流
                    InputStreamReader isr = new InputStreamReader(is,"utf-8");
                    //把字符流包装为BufferReader
                    BufferedReader bfr = new BufferedReader(isr);
                    String in = "";
                    while ((in = bfr.readLine()) != null) {
                        Log.i(TAG,in);
                    }

                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });
    }
}

效果如下：

点击读取txt

二、读取raw文件

1.在res目录下新建一个raw资源目录

2.在raw目录下建一个txt文件

3.读取文件数据,获取raw目录下的文件可以直接用R.raw.xxx

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="zs.readrawdemo.MainActivity">

    <Button
        android:id="@+id/btn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="读取txt">

    </Button>

</android.support.constraint.ConstraintLayout>

MainActivity.java

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        findViewById(R.id.btn).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try {
                //获取raw目录下的文件可以直接用R.raw.xxx
                    InputStream is = getResources().openRawResource(R.raw.test);
                    InputStreamReader isr = new InputStreamReader(is,"utf-8");
                    BufferedReader br = new BufferedReader(isr);
                    String in = "";
                    while ((in = br.readLine())!= null) {
                        System.out.println(in);
                    }
                }catch (Exception e) {
                    e.printStackTrace();
                }

            }
        });
    }
}

效果如下：

点击读取TXT