锁屏效果实现

在onPreparDialog里加入：

public void onPrepareDialog(int id, Dialog d) {
        WindowManager.LayoutParams lp = d.getWindow().getAttributes();
        lp.width = 500;
        lp.height = 300;
        d.getWindow().setAttributes(lp);
        
        switch(id){
        case PROGRAM_INTRODUCE:
            
            // 下面两个动态生成
            @SuppressWarnings("unchecked")
            Map<String, Program> mp = (Map<String, Program>) programAdapter
            .getItem(programListView
                    .getSelectedItemPosition());
            Program pm = mp.get("program");
            LOGD("pm name ="+pm.getName());
            
            if(pm != null){
                program_introduce_alertDialog.setTitle(pm.getName());
                
                if(pm.getIntroduction().equals("")){
                    program_introduce_alertDialog.setMessage(
                            getResources().getString(R.string.program_guide_introduce_null));
                }else{
                    program_introduce_alertDialog.setMessage(pm.getIntroduction());
                }
                
            }else{
                program_introduce_alertDialog.setTitle(getResources().getString(R.string.alert));
                program_introduce_alertDialog.setMessage(
                        getResources().getString(R.string.program_guide_introduce_null));
            }
            
            break;
        }
        
    }

 然后在onCreateDialog里加入：

 

case PROGRAM_INTRODUCE:
            
            program_introduce_alertDialog = new AlertDialog.Builder(this).create();
            
            return program_introduce_alertDialog;

 然后弹出不可见的对话框，屏幕逐渐变暗，按键不起作用，按返回键才返回之前的状态，效果非常炫，用于锁屏幕绝对是最佳选择，效果太好了。