進度欄未顯示在工具欄內

Question

我想顯示包含在工具欄內的進度條。 但是，當我添加layout_gravity =“ bottom”時它不可見，我希望工具欄的進度欄位於底部，就像瀏覽器一樣。 有什么辦法可以做到這一點？ 那Appbarlayout呢？

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:orientation="vertical"
>    <android.support.v7.widget.Toolbar
    android:layout_width="match_parent"
    android:id="@+id/toolbar"
    android:layout_height="?attr/actionBarSize"
    >
    <ProgressBar
        android:id="@+id/progressbar"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:progressBackgroundTint="@color/colorPrimary"
        android:layout_height="3dp"
        android:layout_marginBottom="1dp"
        android:layout_gravity="bottom"
        android:progress="50"
        /> </android.support.v7.widget.Toolbar></LinearLayout>

Answer 1

將此添加到yourstyles.xml中

<resources>

<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
</style>

制作這樣的xml文件

    <?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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.blogspot.android_er.toolbarprogressbar.MainActivity">

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="0dp"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/toolbar"
        app:layout_constraintVertical_bias="0.501" />

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="368dp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="0dp"
        android:layout_marginRight="0dp"
        android:layout_marginTop="0dp"
        android:background="?attr/colorPrimary"
        android:minHeight="?attr/actionBarSize"
        android:theme="?attr/actionBarTheme"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ProgressBar
        android:id="@+id/progressBar"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="0dp"
        android:layout_marginLeft="0dp"
        android:layout_marginRight="0dp"
        app:layout_constraintBottom_toBottomOf="@+id/toolbar"
        app:layout_constraintLeft_toLeftOf="@+id/toolbar"
        app:layout_constraintRight_toRightOf="@+id/toolbar" />

</android.support.constraint.ConstraintLayout>  

在你的活動中

public class MainActivity extends AppCompatActivity {

TextView tvTitle;
ProgressBar myProgressBar;

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

    tvTitle = (TextView)findViewById(R.id.title);
    myProgressBar = (ProgressBar)findViewById(R.id.progressBar);

    tvTitle.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Toast.makeText(getBaseContext(),
                    "ProgressBar start running",
                    Toast.LENGTH_LONG).show();
            tvTitle.setClickable(false);
            MyAsyncTask myAsyncTask = new MyAsyncTask();
            myAsyncTask.execute();
        }
    });
}

public class MyAsyncTask extends AsyncTask<Void, Integer, Void> {

    @Override
    protected void onPreExecute() {
        myProgressBar.setVisibility(View.VISIBLE);
        myProgressBar.setProgress(0);
    }

    @Override
    protected Void doInBackground(Void... voids) {
        for(int i=0; i<100; i++){
            publishProgress(i);
            SystemClock.sleep(100);
        }
        return null;
    }

    @Override
    protected void onProgressUpdate(Integer... values) {
        myProgressBar.setProgress(values[0]);
    }

    @Override
    protected void onPostExecute(Void aVoid) {
        myProgressBar.setVisibility(View.GONE);
        tvTitle.setClickable(true);
    }
}

}

在此演示中，單擊文本“ Hello world”時將顯示進度對話框。

這是來源的鏈接