​​invoke-virtual {v6, v7}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;​​ 转换为java代码为

​​v6.append(v7);​​ 具体参考调试截图

new-instance v6, Ljava/lang/StringBuilder;

    invoke-direct {v6}, Ljava/lang/StringBuilder;-><init>()V

    const-string v7, "RecordThread doRecord: "

    invoke-virtual {v6, v7}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;

    move-result-object v6

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