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// 鑾峰彇TextView
TextView textView = findViewById(R.id.textView);

// 鍒涘缓涓€涓竷灞€鍙傛暟瀵硅薄锛岃缃搴﹀拰楂樺害
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
        LinearLayout.LayoutParams.MATCH_PARENT, // 瀹藉害璁剧疆涓篗ATCH_PARENT
        LinearLayout.LayoutParams.WRAP_CONTENT // 楂樺害璁剧疆涓篧RAP_CONTENT
);

// 璁剧疆TextView鐨勫竷灞€鍙傛暟涓烘柊鍒涘缓鐨勫竷灞€鍙傛暟瀵硅薄
textView.setLayoutParams(layoutParams);

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閫氳繃绫讳技鐨勬柟娉曪紝鍙互鍔ㄦ€佽缃叾浠朧iew鐨勫竷灞€鍙傛暟锛屽彧闇€鏍规嵁闇€瑕佸垱寤哄搴旂殑LayoutParams瀵硅薄锛屽苟璁剧疆鐩稿簲鐨勫弬鏁板€煎嵆鍙€?/p>