第一部分 在drawable中自定義progressBar的樣式
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<!-- 背景 gradient是漸變,corners定義的是圓角 -->
<item android:id="@android:id/background">
<shape>
<corners android:radius="10dp" />
<solid android:color="#f3f3f3" />
</shape>
</item>
<!-- 第二條進度條顏色 -->
<item android:id="@android:id/secondaryProgress">
<clip>
<shape>
<corners android:radius="10dip" />
<gradient
android:angle="90.0"
android:centerColor="#ac6079"
android:centerY="0.45"
android:endColor="#6c213a"
android:startColor="#e71a5e" />
</shape>
</clip>
</item>
<!-- 進度條 -->
<item android:id="@android:id/progress">
<clip>
<shape>
<corners android:radius="10dip" />
<solid android:color="#FF8080" />
</shape>
</clip>
</item>
</layer-list>
第二部分 佈局部分
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/activity_main"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@+id/btn_update"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="update APK!" />
<ProgressBar
android:layout_margin="25dp"
android:background="@drawable/progress_bar"
android:id="@+id/progressbar"
style="?android:attr/progressBarStyleHorizontal"
android:progressDrawable="@drawable/progress_bar"
android:layout_width="match_parent"
android:layout_height="15dp" />
</LinearLayout>
第三部分 activity部分,PS:Activity部分複用的Android菜鳥練習第八課內容具體請查看第八課詳情
public class MainActivity extends Activity {
FinalHttp fh;
ProgressBar progressBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.btn_update).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
update();
}
});
//實例化進度條
progressBar = (ProgressBar) findViewById(R.id.progressbar);
}
public void update() {
//apk安裝路徑
String apkPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/qq.apk";
//判斷安裝路徑是否存在同名APK,若存在則刪除該APK
File f = new File(apkPath);
if (f.exists()) {
f.delete();
}
fh = new FinalHttp();
//第一個參數爲文件下載地址 第二個參數爲APK安裝路徑
fh.download("http://gdown.baidu.com/data/wisegame/4ae6d2d7378e6cdf/QQ_122.apk", apkPath,
new AjaxCallBack<File>() {
@Override
public void onStart() {
super.onStart();
Toast.makeText(getApplicationContext(), "開始下載", Toast.LENGTH_SHORT).show();
}
//count爲下載文件的總長度,current爲當
@Override
public void onLoading(long count, long current) {
super.onLoading(count, current);
//下載進度的百分比
int progress = 0;
if (current != count && current != 0) {
progress = (int) (current / (float) count * 100);
} else {
progress = 100;
}
//設置進度條最大值和當前值
progressBar.setMax((int) count);
progressBar.setProgress((int) current);
}
@Override
public void onSuccess(File t) {
super.onSuccess(t);
Toast.makeText(getApplicationContext(), "下載完成", Toast.LENGTH_SHORT).show();
installApk(t);
}
@Override
public void onFailure(Throwable t, int errorNo, String strMsg) {
super.onFailure(t, errorNo, strMsg);
Toast.makeText(getApplicationContext(), "下載失敗", Toast.LENGTH_SHORT).show();
}
});
}
//安裝APK的方法
private void installApk(File t) {
Toast.makeText(MainActivity.this, t.exists() + "", Toast.LENGTH_SHORT).show();
Intent intent = new Intent();
intent.setAction("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.setDataAndType(Uri.fromFile(t),
"application/vnd.android.package-archive");
startActivity(intent);
}
}