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  • Android 利用代码在屏幕中间位置显示ProgressDialog和ProgressBar

    package cc.testprogressdialog;
    
    import android.os.Bundle;
    import android.view.Gravity;
    import android.view.View;
    import android.view.ViewGroup.LayoutParams;
    import android.widget.FrameLayout;
    import android.widget.LinearLayout;
    import android.widget.ProgressBar;
    import android.app.Activity;
    import android.app.ProgressDialog;
    import android.content.Context;
    /**
     * Demo描述:
     * 利用代码在屏幕中间位置显示ProgressDialog和ProgressBar
     * 
     * 参考资料:
     * 1 http://blog.csdn.net/lfdfhl/article/details/18913435
     * 2 http://blog.csdn.net/lfdfhl/article/details/9299075
     * 3 http://rocye.iteye.com/blog/1258936
     *   Thank you very much
     *   
     * 如果在某个线性布局中动态添加一个控件,并且想让该控件在布局中居中.
     * 也可采用createProgressBar()方法中类似的方式
     *
     */
    public class MainActivity extends Activity {
        private Context mContext;
        private ProgressBar mProgressBar;
        private ProgressDialog mProgressDialog;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);
            //显示ProgressBar
            createProgressBar();
            //显示ProgressDialog
            //createProgressDialog();
        }
        
        private void createProgressBar(){
            mContext=this;
            //整个Activity布局的最终父布局,参见参考资料
            FrameLayout rootFrameLayout=(FrameLayout) findViewById(android.R.id.content);
            FrameLayout.LayoutParams layoutParams=
            new FrameLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
            layoutParams.gravity=Gravity.CENTER;
            mProgressBar=new ProgressBar(mContext);
            mProgressBar.setLayoutParams(layoutParams);
            mProgressBar.setVisibility(View.VISIBLE);
            rootFrameLayout.addView(mProgressBar);
        }
        
        
        private void createProgressDialog(){
            mContext=this;
            mProgressDialog=new ProgressDialog(mContext);
            mProgressDialog.setMessage("...请您稍等...");
            mProgressDialog.show();
        }
    
    }
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  • 原文地址:https://www.cnblogs.com/zhujiabin/p/6965005.html
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