wartank/vendor/fyne.io/fyne/v2/internal/driver/mobile/app/GoNativeActivity.java

package org.golang.app;

import android.app.Activity;
import android.app.NativeActivity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.content.res.Configuration;
import android.graphics.Rect;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.text.Editable;
import android.text.InputType;
import android.text.TextWatcher;
import android.util.Log;
import android.view.Gravity;
import android.view.KeyCharacterMap;
import android.view.View;
import android.view.WindowInsets;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputMethodManager;
import android.view.KeyEvent;
import android.widget.EditText;
import android.widget.FrameLayout;
import android.widget.TextView;
import android.widget.TextView.OnEditorActionListener;

public class GoNativeActivity extends NativeActivity {
	private static GoNativeActivity goNativeActivity;
	private static final int FILE_OPEN_CODE = 1;
	private static final int FILE_SAVE_CODE = 2;

	private static final int DEFAULT_INPUT_TYPE = InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS;

	private static final int DEFAULT_KEYBOARD_CODE = 0;
	private static final int SINGLELINE_KEYBOARD_CODE = 1;
	private static final int NUMBER_KEYBOARD_CODE = 2;
	private static final int PASSWORD_KEYBOARD_CODE = 3;

    private native void filePickerReturned(String str);
    private native void insetsChanged(int top, int bottom, int left, int right);
    private native void keyboardTyped(String str);
    private native void keyboardDelete();
    private native void backPressed();
    private native void setDarkMode(boolean dark);

	private EditText mTextEdit;
	private boolean ignoreKey = false;
	private boolean keyboardUp = false;

	public GoNativeActivity() {
		super();
		goNativeActivity = this;
	}

	String getTmpdir() {
		return getCacheDir().getAbsolutePath();
	}

	void updateLayout() {
	    try {
            WindowInsets insets = getWindow().getDecorView().getRootWindowInsets();
            if (insets == null) {
                return;
            }

            insetsChanged(insets.getSystemWindowInsetTop(), insets.getSystemWindowInsetBottom(),
                insets.getSystemWindowInsetLeft(), insets.getSystemWindowInsetRight());
        } catch (java.lang.NoSuchMethodError e) {
    	    Rect insets = new Rect();
            getWindow().getDecorView().getWindowVisibleDisplayFrame(insets);

            View view = findViewById(android.R.id.content).getRootView();
            insetsChanged(insets.top, view.getHeight() - insets.height() - insets.top,
                insets.left, view.getWidth() - insets.width() - insets.left);
        }
    }

    static void showKeyboard(int keyboardType) {
        goNativeActivity.doShowKeyboard(keyboardType);
        goNativeActivity.keyboardUp = true;
    }

    void doShowKeyboard(final int keyboardType) {
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                int imeOptions = EditorInfo.IME_FLAG_NO_ENTER_ACTION;
                int inputType = DEFAULT_INPUT_TYPE;
                switch (keyboardType) {
                    case DEFAULT_KEYBOARD_CODE:
                        imeOptions = EditorInfo.IME_FLAG_NO_ENTER_ACTION;
                        break;
                    case SINGLELINE_KEYBOARD_CODE:
                        imeOptions = EditorInfo.IME_ACTION_DONE;
                        break;
                    case NUMBER_KEYBOARD_CODE:
                        imeOptions = EditorInfo.IME_ACTION_DONE;
                        inputType |= InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_VARIATION_NORMAL;
                        break;
                    case PASSWORD_KEYBOARD_CODE:
                        imeOptions = EditorInfo.IME_ACTION_DONE;
                        inputType |= InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD;
                    default:
                        Log.e("Fyne", "unknown keyboard type, use default");
                }
                mTextEdit.setImeOptions(imeOptions|EditorInfo.IME_FLAG_NO_FULLSCREEN);
                mTextEdit.setInputType(inputType);

                mTextEdit.setOnEditorActionListener(new OnEditorActionListener() {
                    @Override
                    public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
                        if (actionId == EditorInfo.IME_ACTION_DONE) {
                            keyboardTyped("\n");
                        }
                        return false;
                    }
                });

                // always place one character so all keyboards can send backspace
                ignoreKey = true;
                mTextEdit.setText("0");
                mTextEdit.setSelection(mTextEdit.getText().length());
                ignoreKey = false;

                mTextEdit.setVisibility(View.VISIBLE);
                mTextEdit.bringToFront();
                mTextEdit.requestFocus();

                InputMethodManager m = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                m.showSoftInput(mTextEdit, 0);
            }
        });
    }

    static void hideKeyboard() {
        goNativeActivity.doHideKeyboard();
        goNativeActivity.keyboardUp = false;
    }

    void doHideKeyboard() {
        InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
        View view = findViewById(android.R.id.content).getRootView();
        imm.hideSoftInputFromWindow(view.getWindowToken(), 0);

        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                mTextEdit.setVisibility(View.GONE);
            }
        });
    }

    static void showFileOpen(String mimes) {
        goNativeActivity.doShowFileOpen(mimes);
    }

    void doShowFileOpen(String mimes) {
        Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
        if ("application/x-directory".equals(mimes) && Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            intent = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE); // ask for a directory picker if OS supports it
            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
        } else if (mimes.contains("|") && Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            intent.setType("*/*");
            intent.putExtra(Intent.EXTRA_MIME_TYPES, mimes.split("\\|"));
            intent.addCategory(Intent.CATEGORY_OPENABLE);
        } else {
            intent.setType(mimes);
            intent.addCategory(Intent.CATEGORY_OPENABLE);
        }
        startActivityForResult(Intent.createChooser(intent, "Open File"), FILE_OPEN_CODE);
    }

    static void showFileSave(String mimes, String filename) {
        goNativeActivity.doShowFileSave(mimes, filename);
    }

    void doShowFileSave(String mimes, String filename) {
        Intent intent = new Intent(Intent.ACTION_CREATE_DOCUMENT);
        if (mimes.contains("|") && Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            intent.setType("*/*");
            intent.putExtra(Intent.EXTRA_MIME_TYPES, mimes.split("\\|"));
        } else {
            intent.setType(mimes);
        }
        intent.putExtra(Intent.EXTRA_TITLE, filename);
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        startActivityForResult(Intent.createChooser(intent, "Save File"), FILE_SAVE_CODE);
    }
	static int getRune(int deviceId, int keyCode, int metaState) {
		try {
			int rune = KeyCharacterMap.load(deviceId).get(keyCode, metaState);
			if (rune == 0) {
				return -1;
			}
			return rune;
		} catch (KeyCharacterMap.UnavailableException e) {
			return -1;
		} catch (Exception e) {
			Log.e("Fyne", "exception reading KeyCharacterMap", e);
			return -1;
		}
	}

	private void load() {
		// Interestingly, NativeActivity uses a different method
		// to find native code to execute, avoiding
		// System.loadLibrary. The result is Java methods
		// implemented in C with JNIEXPORT (and JNI_OnLoad) are not
		// available unless an explicit call to System.loadLibrary
		// is done. So we do it here, borrowing the name of the
		// library from the same AndroidManifest.xml metadata used
		// by NativeActivity.
		try {
			ActivityInfo ai = getPackageManager().getActivityInfo(
					getIntent().getComponent(), PackageManager.GET_META_DATA);
			if (ai.metaData == null) {
				Log.e("Fyne", "loadLibrary: no manifest metadata found");
				return;
			}
			String libName = ai.metaData.getString("android.app.lib_name");
			System.loadLibrary(libName);
		} catch (Exception e) {
			Log.e("Fyne", "loadLibrary failed", e);
		}
	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
		load();
		super.onCreate(savedInstanceState);
		setupEntry();
		updateTheme(getResources().getConfiguration());

		View view = findViewById(android.R.id.content).getRootView();
		view.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
			public void onLayoutChange (View v, int left, int top, int right, int bottom,
			                            int oldLeft, int oldTop, int oldRight, int oldBottom) {
				GoNativeActivity.this.updateLayout();
			}
		});
    }

    private void setupEntry() {
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                mTextEdit = new EditText(goNativeActivity);
                mTextEdit.setVisibility(View.GONE);
                mTextEdit.setInputType(DEFAULT_INPUT_TYPE);

                FrameLayout.LayoutParams mEditTextLayoutParams = new FrameLayout.LayoutParams(
                    FrameLayout.LayoutParams.WRAP_CONTENT, FrameLayout.LayoutParams.WRAP_CONTENT);
                mTextEdit.setLayoutParams(mEditTextLayoutParams);
                addContentView(mTextEdit, mEditTextLayoutParams);

                // always place one character so all keyboards can send backspace
                mTextEdit.setText("0");
                mTextEdit.setSelection(mTextEdit.getText().length());

                mTextEdit.addTextChangedListener(new TextWatcher() {
                    @Override
                    public void onTextChanged(CharSequence s, int start, int before, int count) {
                        if (ignoreKey) {
                            return;
                        }
                        if (count > 0) {
                            keyboardTyped(s.subSequence(start,start+count).toString());
                        }
                    }

                    @Override
                    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
                        if (ignoreKey) {
                            return;
                        }
                        if (count > 0) {
                            for (int i = 0; i < count; i++) {
                                // send a backspace
                                keyboardDelete();
                            }
                        }
                    }

                    @Override
                    public void afterTextChanged(Editable s) {
                        // always place one character so all keyboards can send backspace
                        if (s.length() < 1) {
                            ignoreKey = true;
                            mTextEdit.setText("0");
                            mTextEdit.setSelection(mTextEdit.getText().length());
                            ignoreKey = false;
                            return;
                        }
                    }
                });
            }
        });
	}

	@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // unhandled request
        if (requestCode != FILE_OPEN_CODE && requestCode != FILE_SAVE_CODE) {
            return;
        }

        // dialog was cancelled
        if (resultCode != Activity.RESULT_OK) {
            filePickerReturned("");
            return;
        }

        Uri uri = data.getData();
        filePickerReturned(uri.toString());
    }

    @Override
    public void onBackPressed() {
        if (goNativeActivity.keyboardUp) {
            hideKeyboard();
            return;
        }

        // skip the default behaviour - we can call finishActivity if we want to go back
        backPressed();
    }

    public void finishActivity() {
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                GoNativeActivity.super.onBackPressed();
            }
        });
    }

    @Override
    public void onConfigurationChanged(Configuration config) {
        super.onConfigurationChanged(config);
        updateTheme(config);
    }

    protected void updateTheme(Configuration config) {
        boolean dark = (config.uiMode & Configuration.UI_MODE_NIGHT_MASK) == Configuration.UI_MODE_NIGHT_YES;
        setDarkMode(dark);
    }
}