无法在练习android应用中展示完整的LinearLayout

Question

看来我无法将startingPlayerLayout置于其他视图的前面。 我尝试了多种解决方案，最后一个是下面的代码，因此使LinearLayout可见但在后台...（这是我关于Stack Overflow的第一个问题，请原谅任何错误）感谢所有人

public class MainActivity extends AppCompatActivity {

boolean gameFinished = false;

// Player 1 = Black, Player 2 = Red

int playerActive;
int[] gameState = {0, 0, 0, 0, 0, 0, 0, 0, 0};
int[][] winningPositions = {{0, 1, 2}, {3, 4, 5}, {6, 7, 8}, {0, 3, 6}, {1, 4, 7}, {2, 5, 8}, {0, 4, 8}, {2, 4, 6}};

TextView gameInfoField;
Button playAgainButton;
LinearLayout startingPlayerLayout;
ConstraintLayout baseLayout;

// The actual gameplay follows:

public void player1Starts(View view) {
    playerActive = 1;
    startingPlayerLayout.setVisibility(View.INVISIBLE);
}

public void player2Starts(View view) {
    playerActive = 2;
    startingPlayerLayout.setVisibility(View.INVISIBLE);
}

public void playCounter(View view) {
    ImageView counter = (ImageView) view;
    int squarePlayed = Integer.parseInt(counter.getTag().toString());
    gameInfoField = (TextView) findViewById(R.id.gameInfoField);
    if (!gameFinished) {
        if (gameState[squarePlayed] == 0) {
        counter.setTranslationY(-1000f);
            if (playerActive == 1) {
            counter.setImageResource(R.drawable.token_black);
            gameState[squarePlayed] = 1;
            playerActive = 2;
            gameInfoField.setText("Tocca al ROSSO");
            } else {
            counter.setImageResource(R.drawable.token_red);
            gameState[squarePlayed] = 2;
            playerActive = 1;
            gameInfoField.setText("Tocca al NERO");
            }
        counter.animate().translationYBy(1000f);
        } else if (gameState[squarePlayed] == 0 && !gameFinished) {
            Toast.makeText(getApplicationContext(), "La casella è già occupata", Toast.LENGTH_SHORT).show();
        }

    // Need to check if there's a winner, or if it's a draw:

        for (int[] winningPosition : winningPositions) {
            playAgainButton = (Button) findViewById(R.id.playAgainButton);
            if (gameState[winningPosition[0]] == gameState[winningPosition[1]] &&
                gameState[winningPosition[1]] == gameState[winningPosition[2]] &&
                gameState[winningPosition[0]] != 0) {
                gameFinished = true;
                if (gameState[winningPosition[0]] == 1) {
                    gameInfoField.setText("IL NERO VINCE!");
                } else {
                    gameInfoField.setText("IL ROSSO VINCE!");
                }
                gameFinished = true;
                playAgainButton.setVisibility(View.VISIBLE);
            }
            boolean fullBoard = true;
            for (int square : gameState) {
                if (square == 0) {
                    fullBoard = false;
                }
            }
            if (fullBoard && !gameFinished) {
                gameInfoField.setText("Pareggio");
                playAgainButton.setVisibility(View.VISIBLE);
            }
        }
    } else {
        Toast.makeText(getApplicationContext(), "Abbiamo già un vincitore!", Toast.LENGTH_SHORT).show();
    }
}

// And finally, we need to be able to play again if we want to:

public void playAgain(View view) {
    gameFinished = false;
    for (int i = 0; i < gameState.length; i++) {
        gameState[i] = 0;
    }
    GridLayout board = (GridLayout) findViewById(R.id.board);
    for (int i = 0; i < board.getChildCount(); i++) {
        ((ImageView) board.getChildAt(i)).setImageResource(0);
    }
    playAgainButton.setVisibility(View.INVISIBLE);
    baseLayout.bringChildToFront(startingPlayerLayout);
    startingPlayerLayout.setVisibility(View.VISIBLE);
    if (playerActive == 1) {
        gameInfoField.setText("Tocca al NERO");
    }
    else {
        gameInfoField.setText("Tocca al ROSSO");
    }
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    baseLayout = (ConstraintLayout) findViewById(R.id.baseLayout);
    startingPlayerLayout = (LinearLayout) findViewById(R.id.startingPlayerLayout);
    baseLayout.bringChildToFront(startingPlayerLayout);
    startingPlayerLayout.setVisibility(View.VISIBLE);
}
}

这是XML文件（我尝试在其末尾移动LinearLayout，但问题仍然相同）：

<?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:id="@+id/baseLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/holo_blue_bright"
    tools:context="com.williamzannoni.tris.MainActivity">

    <LinearLayout
        android:id="@+id/startingPlayerLayout"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@android:color/holo_orange_light"
        android:gravity="center_horizontal"
        android:orientation="vertical"
        android:paddingBottom="5dp"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"
        android:paddingTop="5dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <TextView
            android:id="@+id/startingPlayerText"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="CHI COMINCIA?"
            android:textSize="25sp"
            tools:layout_editor_absoluteX="8dp"
            tools:layout_editor_absoluteY="5dp" />

        <Button
            android:id="@+id/startingBlackButton"
            android:layout_width="wrap_content"
            android:layout_height="40dp"
            android:layout_marginTop="5dp"
            android:background="?android:attr/colorButtonNormal"
            android:onClick="player1Starts"
            android:text="NERO" />

        <Button
            android:id="@+id/startingRedButton"
            android:layout_width="wrap_content"
            android:layout_height="40dp"
            android:onClick="player2Starts"
            android:text="ROSSO" />

    </LinearLayout>

    <GridLayout
        android:id="@+id/board"
        android:layout_width="368dp"
        android:layout_height="368dp"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:background="@drawable/board_grey"
        android:columnCount="3"
        android:elevation="1dp"
        android:rowCount="3"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.496">

        <ImageView
            android:id="@+id/imageView4"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:layout_marginLeft="12dp"
            android:layout_marginTop="15dp"
            android:onClick="playCounter"
            android:tag="0" />

        <ImageView
            android:id="@+id/imageView3"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:layout_marginLeft="22dp"
            android:layout_marginTop="15dp"
            android:onClick="playCounter"
            android:tag="1" />

        <ImageView
            android:id="@+id/imageView2"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:layout_marginLeft="22dp"
            android:layout_marginTop="15dp"
            android:onClick="playCounter"
            android:tag="2" />

        <ImageView
            android:id="@+id/imageView"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:layout_column="0"
            android:layout_marginLeft="12dp"
            android:layout_marginTop="22dp"
            android:layout_row="1"
            android:onClick="playCounter"
            android:tag="3" />

        <ImageView
            android:id="@+id/imageView7"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:layout_marginLeft="22dp"
            android:layout_marginTop="22dp"
            android:onClick="playCounter"
            android:tag="4" />

        <ImageView
            android:id="@+id/imageView6"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:layout_marginLeft="22dp"
            android:layout_marginTop="22dp"
            android:onClick="playCounter"
            android:tag="5" />

        <ImageView
            android:id="@+id/imageView5"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:layout_column="0"
            android:layout_marginLeft="12dp"
            android:layout_marginTop="22dp"
            android:layout_row="2"
            android:onClick="playCounter"
            android:tag="6" />

        <ImageView
            android:id="@+id/imageView9"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:layout_marginLeft="22dp"
            android:layout_marginTop="22dp"
            android:onClick="playCounter"
            android:tag="7" />

        <ImageView
            android:id="@+id/imageView8"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:layout_column="2"
            android:layout_marginLeft="22dp"
            android:layout_marginTop="22dp"
            android:layout_row="2"
            android:onClick="playCounter"
            android:tag="8" />

    </GridLayout>

    <TextView
        android:id="@+id/gameInfoField"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:background="@android:color/holo_blue_bright"
        android:padding="10dp"
        android:text="Tocca al NERO"
        android:textSize="25sp"
        app:layout_constraintBottom_toTopOf="@+id/board"
        app:layout_constraintHorizontal_bias="0.502"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.727" />

    <Button
        android:id="@+id/playAgainButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginStart="8dp"
        android:background="@android:color/holo_blue_dark"
        android:onClick="playAgain"
        android:padding="10dp"
        android:text="GIOCA ANCORA"
        android:visibility="invisible"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent" />

</android.support.constraint.ConstraintLayout>

Answer 1

在XML中声明的视图的顺序在这里很重要。 首先在R.layout.activity_main声明的视图将在XML文件底部附近的视图之前绘制。

这意味着您可能必须对布局文件中的视图重新排序才能获得所需的设计。

附言：如果您发布布局文件，我们可以尝试进一步提供帮助。