Refactored HomeScreenActivity into several smaller classes.

briar-android/src/org/briarproject/android/PasswordActivity.java

@@ -0,0 +1,154 @@
+package org.briarproject.android;
+
+import static android.text.InputType.TYPE_CLASS_TEXT;
+import static android.text.InputType.TYPE_TEXT_VARIATION_PASSWORD;
+import static android.view.Gravity.CENTER;
+import static android.view.Gravity.CENTER_HORIZONTAL;
+import static android.view.View.GONE;
+import static android.view.View.VISIBLE;
+import static android.view.inputmethod.InputMethodManager.HIDE_IMPLICIT_ONLY;
+import static android.widget.LinearLayout.VERTICAL;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_MATCH;
+import static org.briarproject.android.util.CommonLayoutParams.WRAP_WRAP;
+
+import java.util.concurrent.Executor;
+
+import javax.inject.Inject;
+
+import org.briarproject.R;
+import org.briarproject.android.util.FixedVerticalSpace;
+import org.briarproject.android.util.LayoutUtils;
+import org.briarproject.api.crypto.CryptoComponent;
+import org.briarproject.api.crypto.CryptoExecutor;
+import org.briarproject.api.db.DatabaseConfig;
+import org.briarproject.util.StringUtils;
+
+import roboguice.activity.RoboActivity;
+import android.content.SharedPreferences;
+import android.os.Bundle;
+import android.text.Editable;
+import android.view.KeyEvent;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.inputmethod.InputMethodManager;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.LinearLayout;
+import android.widget.ProgressBar;
+import android.widget.TextView;
+import android.widget.TextView.OnEditorActionListener;
+
+public class PasswordActivity extends RoboActivity {
+
+	@Inject private DatabaseConfig databaseConfig;
+	@Inject @CryptoExecutor private Executor cryptoExecutor;
+	private TextView enterPassword = null;
+	private Button continueButton = null;
+	private ProgressBar progress = null;
+
+	// Fields that are accessed from background threads must be volatile
+	@Inject private volatile CryptoComponent crypto;
+
+	@Override
+	public void onCreate(Bundle state) {
+		super.onCreate(state);
+
+		SharedPreferences prefs = getSharedPreferences("db", MODE_PRIVATE);
+		String hex = prefs.getString("key", null);
+		if(hex == null) throw new IllegalStateException();
+		final byte[] encrypted = StringUtils.fromHexString(hex);
+
+		LinearLayout layout = new LinearLayout(this);
+		layout.setLayoutParams(MATCH_MATCH);
+		layout.setOrientation(VERTICAL);
+		layout.setGravity(CENTER_HORIZONTAL);
+
+		int pad = LayoutUtils.getPadding(this);
+
+		enterPassword = new TextView(this);
+		enterPassword.setGravity(CENTER);
+		enterPassword.setTextSize(18);
+		enterPassword.setPadding(pad, pad, pad, 0);
+		enterPassword.setText(R.string.enter_password);
+		layout.addView(enterPassword);
+
+		final EditText passwordEntry = new EditText(this);
+		passwordEntry.setId(1);
+		passwordEntry.setMaxLines(1);
+		int inputType = TYPE_CLASS_TEXT | TYPE_TEXT_VARIATION_PASSWORD;
+		passwordEntry.setInputType(inputType);
+		passwordEntry.setOnEditorActionListener(new OnEditorActionListener() {
+			public boolean onEditorAction(TextView v, int action, KeyEvent e) {
+				validatePassword(encrypted, passwordEntry.getText());
+				return true;
+			}
+		});
+		layout.addView(passwordEntry);
+
+		// Adjusting the padding of buttons and EditTexts has the wrong results
+		layout.addView(new FixedVerticalSpace(this));
+
+		continueButton = new Button(this);
+		continueButton.setLayoutParams(WRAP_WRAP);
+		continueButton.setText(R.string.continue_button);
+		continueButton.setOnClickListener(new OnClickListener() {
+			public void onClick(View v) {
+				validatePassword(encrypted, passwordEntry.getText());
+			}
+		});
+		layout.addView(continueButton);
+
+		progress = new ProgressBar(this);
+		progress.setLayoutParams(WRAP_WRAP);
+		progress.setIndeterminate(true);
+		progress.setVisibility(GONE);
+		layout.addView(progress);
+		setContentView(layout);
+	}
+
+	private void validatePassword(final byte[] encrypted, Editable e) {
+		if(enterPassword == null || continueButton == null || progress == null)
+			return;
+		// Hide the soft keyboard
+		Object o = getSystemService(INPUT_METHOD_SERVICE);
+		((InputMethodManager) o).toggleSoftInput(HIDE_IMPLICIT_ONLY, 0);
+		// Replace the button with a progress bar
+		continueButton.setVisibility(GONE);
+		progress.setVisibility(VISIBLE);
+		// Decrypt the database key in a background thread
+		int length = e.length();
+		final char[] password = new char[length];
+		e.getChars(0, length, password, 0);
+		e.delete(0, length);
+		cryptoExecutor.execute(new Runnable() {
+			public void run() {
+				byte[] key = crypto.decryptWithPassword(encrypted, password);
+				if(key == null) {
+					tryAgain();
+				} else {
+					databaseConfig.setEncryptionKey(key);
+					returnOk();
+				}
+			}
+		});
+	}
+
+	private void tryAgain() {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				enterPassword.setText(R.string.try_again);
+				continueButton.setVisibility(VISIBLE);
+				progress.setVisibility(GONE);
+			}
+		});
+	}
+
+	private void returnOk() {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				setResult(RESULT_OK);
+				finish();
+			}
+		});
+	}
+}