一手遮天 Android - view(进度类): SeekBar 基础
一手遮天 Android - view(进度类): SeekBar 基础
示例如下:
/view/progress/SeekBarDemo1.java
/**
* SeekBar - 拖动条
* setOnSeekBarChangeListener(OnSeekBarChangeListener l) - 拖动条发生改变时的回调
* OnSeekBarChangeListener
* onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) - 进度值发生变化
* progress - 当前进度值
* fromUser - 是否是用户操作导致的进度变化(比如用户拖动了进度则此值为 true;程序修改了进度则此值为 false)
* onStartTrackingTouch(SeekBar seekBar) - 拖动开始
* onStopTrackingTouch(SeekBar seekBar) - 拖动结束
*/
package com.webabcd.androiddemo.view.progress;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;
import com.webabcd.androiddemo.R;
public class SeekBarDemo1 extends AppCompatActivity {
private TextView _textView1;
private SeekBar _seekBar1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_progress_seekbardemo1);
_textView1 = (TextView)findViewById(R.id.textView1);
_seekBar1 = (SeekBar)findViewById(R.id.seekBar1);
sample();
}
private void sample() {
_seekBar1.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
_textView1.setText(String.format("progress:%d, fromUser:%b", progress, fromUser));
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
Toast.makeText(getApplicationContext(), "start tracking touch", Toast.LENGTH_SHORT).show();
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
Toast.makeText(getApplicationContext(), "stop tracking touch", Toast.LENGTH_SHORT).show();
}
});
// 在 java 中设置拖动条的进度
_seekBar1.setProgress(30);
}
}
/layout/activity_view_progress_seekbardemo1.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<!--
SeekBar - 拖动条
min - 最小值
max - 最大值
progress - 进度值(相当于播放器的当前播放位置)
secondaryProgress - 第二进度的进度值(相当于播放器的当前已缓冲位置)
-->
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<SeekBar
android:id="@+id/seekBar1"
android:layout_width="300dp"
android:layout_height="30dp"
android:layout_marginTop="10dp"
android:min="0"
android:max="100"
android:progress="10"
android:secondaryProgress="70" />
</LinearLayout>