Android-使用意图从手机内存中打开文件 [英] Android - open file from phone memory using intent

问题描述

我正在开发一个应用程序，该应用程序将手机中的.txt文件作为输入并打印在TextView上，

I am working on an app that takes the .txt file from a phone as input and prints it on the TextView,

public class MainActivity extends AppCompatActivity {
Button button;
Intent intent;private StringBuilder text = new StringBuilder();



private InputStream getResources(String s) {
    return null;
}

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

    button = (Button) findViewById(R.id.btn);

    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            intent = new Intent(Intent.ACTION_GET_CONTENT);
            intent.setType("text/plain");
            startActivityForResult(intent, 7);
            Log.v("###", "parent "  + getParent());
        }

    });
} @Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    String Fpath = data.getDataString();
  //  final String fileName = ""+Fpath;
    Log.v("###", "yo " +Fpath);

    super.onActivityResult(requestCode, resultCode, data);

    switch (requestCode) {
        case 7:

            if (resultCode == RESULT_OK) {
                setContentView(R.layout.activity_main);


                Log.v("###", "hellow");
                setContentView(R.layout.activity_main);
                BufferedReader reader = null;

                try {

                    reader = new BufferedReader(

             new InputStreamReader(getAssets().open("filename.txt")));
                    //change code
                    // do reading
                    String mLine;
                    while ((mLine = reader.readLine()) != null) {
                        text.append(mLine);
                        text.append('\n');
                    }
                } catch (IOException e) {
                    String PathHolder = data.getData().getPath();
                    Toast.makeText(MainActivity.this, PathHolder, Toast.LENGTH_LONG).show();
                    e.printStackTrace();
                } finally {


                    if (reader != null) {
                        try {
                            reader.close();
                        } catch (IOException e) {
                            //log the exception
                        }
                    }

                    TextView output = (TextView) findViewById(R.id.Txt);
                    output.setText((CharSequence) text);

                }
            }
    }
}
}

一切都很好，但是这行

new InputStreamReader（getAssets（）。open（ filename.txt））））;

从Assets文件夹中获取文件，
帮助我从手机中获取文件，

Taking the file from Assets folder, Help me to get the file from My phone,

资产文件夹中的文件可以正常打开，但我希望从手机中选择该文件

The file from Assets folder opening properly but I want it to be select from my phone

推荐答案

您从文件管理器中选择的 onActivityResult 中的文件路径。

You can get file path in onActivityResult which you selected from file manager.

 Uri PathHolder = data.getData();

更新

上一行为您提供了从存储中选择的 uri文件。然后，您可以轻松地从该Uri中获取文件。

Above line give you uri of file which you selected from storage. Then You can get File from that Uri easily.

只是忘记了 getAssets 使用以下方法从文件中读取。

Just forgot about getAssets Use Following method to read from file.

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    Uri PathHolder = data.getData();
    FileInputStream fileInputStream = null;
    StringBuilder text = new StringBuilder();
    try {
        InputStream inputStream = getContentResolver().openInputStream(PathHolder);
        BufferedReader r = new BufferedReader(new InputStreamReader(inputStream));
        String mLine;
        while ((mLine = r.readLine()) != null) {
            text.append(mLine);
            text.append('\n');
        }
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

}

这篇关于Android-使用意图从手机内存中打开文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！