Java 使用保存的文件数组填充线性布局

我正在练习创建一个应用程序，允许用户在不同的活动中编写笔记、存储笔记并将其作为单独的图标查看。 我已经安排了三个不同的活动

主页：初始活动开始的位置

输入活动：用户写入和保存注释的地方

“工具架”活动以显示以前编写的笔记

总的来说，我相信我已经完成了与最初两项活动相关的任务。我能够保存这些文件，并且有一个简单的循环来增加文件名

我遇到的问题是在不同的活动中访问保存的文件。此外，我没有成功地从文件名创建数组

MainPageActivity

public class MainPageActivity extends AppCompatActivity {

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main_page);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        FloatingActionButton fab = findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View LoginActivity) {
                Snackbar.make(LoginActivity, "Begin Writing Your Own Diary", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
                launchActivity();
            }
        }
        );
    }

    public void launchActivity(){
        Intent intent = new Intent(this, InputActivity.class);
        startActivity(intent);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main_page, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

public class InputActivity extends AppCompatActivity {
    private TextView text;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_input);
        text = findViewById(R.id.textView);
        Button button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                saveText();
                LaunchActivity();
            }
        });
    }

    public void saveText(){
        int num = 0;
        String fileContents = text.getText().toString();
        FileOutputStream outputStream;
        String fileName = ("");
        if (fileName == fileName) {
            num++;
            fileName = "diary"+num+".txt";
        }
        try {
            outputStream = openFileOutput(fileName, Context.MODE_PRIVATE);
            outputStream.write(fileContents.getBytes());
            outputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void LaunchActivity(){
        Intent intent = new Intent(this, ShelfActivity.class);
        startActivity(intent);
    }
}

public class ShelfActivity extends AppCompatActivity {
    File path = getFilesDir();
    File file[]=path.listFiles();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_shelf);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
            }
        });
        loadViews();
    }

    public void loadViews() {
        String[] textArray = file[];
        LinearLayout linLayout = new LinearLayout(this);
        setContentView(linLayout);
        linLayout.setOrientation(LinearLayout.VERTICAL);
        for (int i = 0; i<textArray.length; i++) {
            TextView view = new TextView(this);
            view.setText(textArray[i]);
            linLayout.addView(view);
        }
    }

    public void loadFiles() {

    }
}

输入活动

public class MainPageActivity extends AppCompatActivity {

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main_page);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        FloatingActionButton fab = findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View LoginActivity) {
                Snackbar.make(LoginActivity, "Begin Writing Your Own Diary", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
                launchActivity();
            }
        }
        );
    }

    public void launchActivity(){
        Intent intent = new Intent(this, InputActivity.class);
        startActivity(intent);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main_page, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

public class InputActivity extends AppCompatActivity {
    private TextView text;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_input);
        text = findViewById(R.id.textView);
        Button button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                saveText();
                LaunchActivity();
            }
        });
    }

    public void saveText(){
        int num = 0;
        String fileContents = text.getText().toString();
        FileOutputStream outputStream;
        String fileName = ("");
        if (fileName == fileName) {
            num++;
            fileName = "diary"+num+".txt";
        }
        try {
            outputStream = openFileOutput(fileName, Context.MODE_PRIVATE);
            outputStream.write(fileContents.getBytes());
            outputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void LaunchActivity(){
        Intent intent = new Intent(this, ShelfActivity.class);
        startActivity(intent);
    }
}

public class ShelfActivity extends AppCompatActivity {
    File path = getFilesDir();
    File file[]=path.listFiles();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_shelf);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
            }
        });
        loadViews();
    }

    public void loadViews() {
        String[] textArray = file[];
        LinearLayout linLayout = new LinearLayout(this);
        setContentView(linLayout);
        linLayout.setOrientation(LinearLayout.VERTICAL);
        for (int i = 0; i<textArray.length; i++) {
            TextView view = new TextView(this);
            view.setText(textArray[i]);
            linLayout.addView(view);
        }
    }

    public void loadFiles() {

    }
}

ShelfActivity

public class MainPageActivity extends AppCompatActivity {

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main_page);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        FloatingActionButton fab = findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View LoginActivity) {
                Snackbar.make(LoginActivity, "Begin Writing Your Own Diary", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
                launchActivity();
            }
        }
        );
    }

    public void launchActivity(){
        Intent intent = new Intent(this, InputActivity.class);
        startActivity(intent);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main_page, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

public class InputActivity extends AppCompatActivity {
    private TextView text;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_input);
        text = findViewById(R.id.textView);
        Button button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                saveText();
                LaunchActivity();
            }
        });
    }

    public void saveText(){
        int num = 0;
        String fileContents = text.getText().toString();
        FileOutputStream outputStream;
        String fileName = ("");
        if (fileName == fileName) {
            num++;
            fileName = "diary"+num+".txt";
        }
        try {
            outputStream = openFileOutput(fileName, Context.MODE_PRIVATE);
            outputStream.write(fileContents.getBytes());
            outputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void LaunchActivity(){
        Intent intent = new Intent(this, ShelfActivity.class);
        startActivity(intent);
    }
}

public class ShelfActivity extends AppCompatActivity {
    File path = getFilesDir();
    File file[]=path.listFiles();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_shelf);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
            }
        });
        loadViews();
    }

    public void loadViews() {
        String[] textArray = file[];
        LinearLayout linLayout = new LinearLayout(this);
        setContentView(linLayout);
        linLayout.setOrientation(LinearLayout.VERTICAL);
        for (int i = 0; i<textArray.length; i++) {
            TextView view = new TextView(this);
            view.setText(textArray[i]);
            linLayout.addView(view);
        }
    }

    public void loadFiles() {

    }
}

在方法loadViews（）中，出现意外的令牌错误

我可能有其他我看不到的错误和功能错误。请指出它们，这样我就可以从错误中吸取教训

PS，我的权限设置为：

<uses-permission android:name="android.permission.WRITE_INTERNAL_STORAGE"/> 
<uses-permission android:name="android.permission.READ_INTERNAL_STORAGE"/> 

---

另外，我对Android Studio和Java基本上还是比较陌生的，您认为还有哪些方法更容易完成我正在尝试的任务？

您正在尝试通过简单的赋值将文件数组转换为字符串数组。那是行不通的。请尝试以下方法：

String[] textArray = new String[file.length];
for(int i = 0; i < file.length; i++) {
    textArray[i] = file[i].getName();
}

---

嗨，谢谢你的回复，它帮助了很多！我还想问您，因为我有一个单独的方法loadViews（），这是否意味着我必须为路径或文件声明一个构造函数？我得到了未解决的符号，而我没有。我想知道它背后的原因，或者你是否有一个链接可以帮助我更好地理解Java结构。据我所知，它的目的是初始化类的对象，为什么这么重要？听起来你应该花点时间阅读一些基本的Java概念。我相信你能找到一本比我更好的教程/书/课程来解释它。此外，请考虑接受我的答案，如果它帮助您解决您的问题。祝你好运