Die Anleitung zu Android SeekBar

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1- Was ist SeekBar?

Ein  SeekBar ist eine aus  ProgressBar erweiterte Klasse mit einer Ergänzung von dem Hebel. Der Benutzer kann den Hebel klicken und nach links oder rechts schieben um die Wert des Progress zu etablieren oder kann die Pfeile benutzen um den Hebel zu bewegen. Sie können auf dem linken oder rechten Bar des Hebel zur Bewegung benutzen, obwohl es nicht empfohlen ist
Unten sind die einige Muster  SeekBar:

2- Zum Beispiel: SeekBar

Erstellen Sie ein Projekt mit dem Name von  SeekBarDemo.
Bauen Sie das Interface der Applikation
  • SLIDER:
Das Interface der Applikation
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="org.o7planning.seekbardemo.MainActivity">

    <SeekBar
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/seekBar"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:max="100"
        android:progress="15"
        android:indeterminate="false" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Medium Text"
        android:id="@+id/textView"
        android:layout_below="@+id/seekBar"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="35dp"
        android:layout_alignRight="@+id/seekBar"
        android:layout_alignEnd="@+id/seekBar"
        android:gravity="center" />

    <Button
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=">>"
        android:id="@+id/button_increase"
        android:layout_marginTop="69dp"
        android:layout_below="@+id/textView"
        android:layout_toRightOf="@+id/button_decrease"
        android:layout_toEndOf="@+id/button_decrease" />

    <Button
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="&lt;&lt;"
        android:id="@+id/button_decrease"
        android:layout_marginLeft="116dp"
        android:layout_marginStart="116dp"
        android:layout_alignTop="@+id/button_increase"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

</RelativeLayout>
MainActivity.java
package org.o7planning.seekbardemo;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

  private SeekBar seekBar;
  private TextView textView;
  private Button buttonDecrease;
  private Button buttonIncrease;

  private static int DELTA_VALUE = 5;

  private static final String LOGTAG = "SeekBarDemo";


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

      //
      this.seekBar = (SeekBar) findViewById(R.id.seekBar );
      this.textView = (TextView) findViewById(R.id.textView);


      this.buttonDecrease= (Button) findViewById(R.id.button_decrease);
      this.buttonIncrease= (Button) findViewById(R.id.button_increase);


      this.textView.setText("Progress: " + seekBar.getProgress() + "/" + seekBar.getMax());
      //
      this.seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
          int progress = 0;

          // When Progress value changed.
          @Override
          public void onProgressChanged(SeekBar seekBar, int progressValue, boolean fromUser) {
              progress = progressValue;
              textView.setText("Progress: " + progressValue + "/" + seekBar.getMax());
              Log.i(LOGTAG, "Changing seekbar's progress");
              Toast.makeText(getApplicationContext(), "Changing seekbar's progress", Toast.LENGTH_SHORT).show();
          }

          // Notification that the user has started a touch gesture.
          @Override
          public void onStartTrackingTouch(SeekBar seekBar) {
              Log.i(LOGTAG, "Started tracking seekbar");
              Toast.makeText(getApplicationContext(), "Started tracking seekbar", Toast.LENGTH_SHORT).show();
          }

          // Notification that the user has finished a touch gesture
          @Override
          public void onStopTrackingTouch(SeekBar seekBar) {
              textView.setText("Progress: " + progress + "/" + seekBar.getMax());
              Log.i(LOGTAG, "Stopped tracking seekbar");
              Toast.makeText(getApplicationContext(), "Stopped tracking seekbar", Toast.LENGTH_SHORT).show();

          }
      });

      this.buttonDecrease.setOnClickListener(new Button.OnClickListener() {

          @Override
          public void onClick(View v) {
              decreateProgress();
          }
      });

      this.buttonIncrease.setOnClickListener(new Button.OnClickListener() {

          @Override
          public void onClick(View v) {
              increateProgress();
          }
      });
  }


   private void decreateProgress()  {
       int progress= this.seekBar.getProgress();
       if(progress - DELTA_VALUE < 0)  {
           this.seekBar.setProgress(0);
       } else  {
           this.seekBar.setProgress(progress - DELTA_VALUE);
       }
       textView.setText("Progress: " + seekBar.getProgress()+ "/" + seekBar.getMax());
   }

   private void increateProgress()  {
       int progress= this.seekBar.getProgress();
       if(progress + DELTA_VALUE > this.seekBar.getMax())  {
           this.seekBar.setProgress(0);
       }else {
           this.seekBar.setProgress(progress + DELTA_VALUE);
       }
       textView.setText("Progress: " + seekBar.getProgress()+ "/" + seekBar.getMax());      
   }

}
Starten Sie Ihre Applikation

3- Die anpassende SeekBar

  • TODO

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